diff --git a/verarbeitung/Processing.py b/verarbeitung/Processing.py
index 89f1ef2707d456c565adca8988d1ebe27b6501e3..ac85f522ac884d5e48fedef2f42f256bba610c79 100644
--- a/verarbeitung/Processing.py
+++ b/verarbeitung/Processing.py
@@ -25,9 +25,13 @@ from json_demo import output_to_json
 # doi_input_list: list of publication dois from user
 
 # TO-DO: Listenelemente auf Korrektheit überprüfen
-def initialize_nodes_list(doi_input_list):
+def initialize_nodes_list(doi_input_list, test_var):
     for pub_doi in doi_input_list:
-        pub = input_test_func(pub_doi)
+        if(test_var):
+            pub = input_test_func(pub_doi)
+        else:
+            pub = input(pub_doi)
+
         not_in_nodes = True
         for node in nodes:                                              # checks if a pub is already in nodes
             if (pub.doi_url == node.doi_url):
@@ -35,6 +39,7 @@ def initialize_nodes_list(doi_input_list):
                 break
         if (not_in_nodes):
             nodes.append(pub)
+            #print(pub.doi_url)
             pub.group = "input"
         else:
             doi_input_list.remove(pub_doi)
@@ -55,11 +60,11 @@ def create_graph_structure_citations(pub, search_height, search_height_max):
             if (search_height <= search_height_max):
                 citation.group = "height"
                 nodes.append(citation)
-                edges.append([pub.doi_url,citation.doi_url])
+                edges.append([citation.doi_url,pub.doi_url])
 
         # adds only edge if citation already exists         
         else:
-            edges.append([pub.doi_url,citation.doi_url])    
+            edges.append([citation.doi_url,pub.doi_url])   
 
 
 
@@ -77,11 +82,11 @@ def create_graph_structure_references(pub, search_depth, search_depth_max):
             if (search_depth <= search_depth_max):
                 reference.group = "depth"
                 nodes.append(reference)
-                edges.append([reference.doi_url,pub.doi_url])
+                edges.append([pub.doi_url,reference.doi_url])
 
         # adds only edge if citation already exists           
         else:
-            edges.append([reference.doi_url,pub.doi_url])       
+            edges.append([pub.doi_url,reference.doi_url])      
     
 
 
@@ -89,13 +94,17 @@ def create_graph_structure_references(pub, search_depth, search_depth_max):
 # doi_citations: input list of citet dois
 # search_height: current search_height of height-first-search
 # search_height_max: maximal search_height for dfs
-def process_citations_rec(doi_citations, search_height, search_height_max):  
+def process_citations_rec(doi_citations, search_height, search_height_max, test_var):  
     # height of search is increased by 1 with each recursive call
     search_height += 1
 
     # create class object for every citation from list
     for pub_doi in doi_citations:
-        pub = input_test_func(pub_doi)
+        if (test_var):
+            pub = input_test_func(pub_doi)
+        else:
+            pub = input(pub_doi)
+
         create_graph_structure_citations(pub, search_height, search_height_max)    
         # If the maximum height has not yet been reached, all references from the publication 
         # are written to an array and the function is called again with this array.       
@@ -109,7 +118,7 @@ def process_citations_rec(doi_citations, search_height, search_height_max):
                     citations_list.append(citation.doi_url)
 
             # recursive call of function.
-            process_citations_rec(citations_list, search_height, search_height_max)
+            process_citations_rec(citations_list, search_height, search_height_max, test_var)
 
 
 
@@ -117,13 +126,17 @@ def process_citations_rec(doi_citations, search_height, search_height_max):
 # doi_references: input list of referenced dois
 # search_depth: current search_depth of height-first-search
 # search_depth_max: maximal search_depth for dfs
-def process_references_rec(doi_references, search_depth, search_depth_max):  
+def process_references_rec(doi_references, search_depth, search_depth_max, test_var):  
     # The depth is increased by 1 with each recursive call
     search_depth += 1
 
     # create class object for every citation from list
     for pub_doi in doi_references:
-        pub = input_test_func(pub_doi)
+        if (test_var):
+            pub = input_test_func(pub_doi)
+        else:
+            pub = input(pub_doi)
+
         create_graph_structure_references(pub, search_depth, search_depth_max)    
         # If the maximum depth has not yet been reached, all references from the publication 
         # are written to an array and the function is called again with this array.       
@@ -133,16 +146,17 @@ def process_references_rec(doi_references, search_depth, search_depth_max):
 
                 # currently only the references with acs are stored in the URL, because we can't 
                 # extract the info from other sources. 
-                if ("acs" in reference.doi_url):
+                if ("acs" in reference.doi_url or test_var == True):
                     references_list.append(reference.doi_url)
 
+
             # recursive call of function.
-            process_references_rec(references_list, search_depth, search_depth_max)
+            process_references_rec(references_list, search_depth, search_depth_max, test_var)
 
 
 
            
-def process_main(doi_input_list, search_height, search_depth):
+def process_main(doi_input_list, search_height, search_depth, test_var = False):
     # ERROR-Handling doi_array = NULL
     if (len(doi_input_list) == 0):
         print("Error, no input data")
@@ -161,16 +175,33 @@ def process_main(doi_input_list, search_height, search_depth):
     nodes = []
     edges = []
 
-    initialize_nodes_list(doi_input_list)
-    process_citations_rec(doi_input_list, 0, search_height)
-    process_references_rec(doi_input_list, 0, search_depth)
+    initialize_nodes_list(doi_input_list,test_var)
+    process_citations_rec(doi_input_list, 0, search_height, test_var)
+    process_references_rec(doi_input_list, 0, search_depth, test_var)
 
     output_to_json(nodes,edges)
 
     # only for internal testing
     return(nodes,edges)
 
+def print_graph(nodes, edges):
+    print("Knoten:\n")
+    for node in nodes:
+        print(node.title, "\n")
+    print("\n Kanten:\n")
+    for edge in edges:
+        print(edge,"\n")
+   
+
+# function to test cycles
+def test_cycle():
+    arr = []
+    arr.append('doiz1')
+    #arr.append('doiz2')
 
+    nodes,edges = process_main(arr,1,1,True)
+
+    print_graph(nodes, edges)
     
 # program test, because there is no connection to the input yet.
 def test_print():
@@ -185,19 +216,11 @@ def test_print():
     #url = sys.argv[1]
     #arr.append[url]
 
-    arr.append('doi1')
-    #arr.append('doi2')
-    #arr.append('doi3')
-
 
-    nodes,edges = process_main(arr,1,1)
+    nodes,edges = process_main(arr,2,2,True)
 
-    print("Knoten:\n")
-    for node in nodes:
-        print(node.title, "\n")
-    print("\n Kanten:\n")
-    for edge in edges:
-        print(edge,"\n")
+    print_graph(nodes, edges)
 
-test_print()
+#test_print()
+test_cycle()
         
\ No newline at end of file
diff --git a/verarbeitung/__pycache__/input_test.cpython-39.pyc b/verarbeitung/__pycache__/input_test.cpython-39.pyc
new file mode 100644
index 0000000000000000000000000000000000000000..d5948ff804073098a6d097ad17e81503eb7ec86b
Binary files /dev/null and b/verarbeitung/__pycache__/input_test.cpython-39.pyc differ
diff --git a/verarbeitung/__pycache__/json_demo.cpython-39.pyc b/verarbeitung/__pycache__/json_demo.cpython-39.pyc
index 29c2c14b5229d9768c2a273f8e1adba6cfcfc63f..a4f37b5097c0c5a82e7d36cd45671fb178e749ca 100644
Binary files a/verarbeitung/__pycache__/json_demo.cpython-39.pyc and b/verarbeitung/__pycache__/json_demo.cpython-39.pyc differ
diff --git a/verarbeitung/input_test.py b/verarbeitung/input_test.py
index 79b00b1ce11e63f73e11251352745a673b8face9..c55f85219a7df0c76d37e6a34211a7c14ea3f1d7 100644
--- a/verarbeitung/input_test.py
+++ b/verarbeitung/input_test.py
@@ -60,4 +60,7 @@ beispiel1 = ['doi1', 'title1', ['contributor1'], 'journal1', 'date1', ['doi2'],
 beispiel2 = ['doi2', 'title2', ['contributor2'], 'journal2', 'date2', [], ['doi1'], '']
 beispiel3 = ['doi3', 'title3', ['contributor3'], 'journal3', 'date3', ['doi1'], [], '']
 
-list_of_arrays = [beispiel1, beispiel2, beispiel3]
+zyklus1 = ['doiz1', 'titlez1', ['contributorz1.1', 'contributorz1.2'], 'journalz1', 'datez1', ['doiz2'], ['doiz2'], '']
+zyklus2 = ['doiz2', 'titlez2', ['contributorz2.1', 'contributorz2.2'], 'journalz2', 'datez2', ['doiz1'], ['doiz1'], '']
+
+list_of_arrays = [beispiel1, beispiel2, beispiel3, zyklus1, zyklus2]
diff --git a/verarbeitung/json_text.json b/verarbeitung/json_text.json
index 683e49f3e3175e12dcbe10df1e48c51dd27a8b77..8f648bf42654aefc13dd47dcecee507306184420 100644
--- a/verarbeitung/json_text.json
+++ b/verarbeitung/json_text.json
@@ -1 +1 @@
-{"nodes": [{"name": "title1", "author": ["contributor1"], "year": "date1", "journal": "journal1", "doi": "doi1", "group": "input"}, {"name": "title3", "author": ["contributor3"], "year": "date3", "journal": "journal3", "doi": "doi3", "group": "height"}, {"name": "title2", "author": ["contributor2"], "year": "date2", "journal": "journal2", "doi": "doi2", "group": "depth"}], "links": [{"source": "doi1", "target": "doi3"}, {"source": "doi2", "target": "doi1"}]}
\ No newline at end of file
+{"nodes": [{"name": "titlez1", "author": ["contributorz1.1", "contributorz1.2"], "year": "datez1", "journal": "journalz1", "doi": "doiz1", "group": "input"}, {"name": "titlez2", "author": ["contributorz2.1", "contributorz2.2"], "year": "datez2", "journal": "journalz2", "doi": "doiz2", "group": "depth"}], "links": [{"source": "doiz1", "target": "doiz2"}]}
\ No newline at end of file
diff --git "a/verarbeitung/n\303\266tige Tests.txt" "b/verarbeitung/n\303\266tige Tests.txt"
new file mode 100644
index 0000000000000000000000000000000000000000..95563280436fbf6b9b8702dffef6f32e213f5a16
--- /dev/null
+++ "b/verarbeitung/n\303\266tige Tests.txt"	
@@ -0,0 +1,4 @@
+Zyklus
+großer Zyklus
+Innere Kanten vervollständigen
+