check references and added comments to forms url and admin

doc/bachelorarbeit_EstherKleinhenz/references/References_2.bib

@@ -47,13 +47,6 @@
    note = "https://docs.python.org/3/tutorial/venv.html" 
    }
    
-  @article{Dixit,
-   author = "Chitrank Dixit",
-   title = "PEP-8 Tutorial: Code Standards in Python",
-   year = "2018",
-   note = "https://www.datacamp.com/community/tutorials/pep8-tutorial-python-code" 
-   }
-   
    @article{Shabda,
    author = "Shabda",
    title = "Understanding decorators",
@@ -96,20 +89,6 @@
    note = "Kapitel 23.1"
    }
    
-   @article{Schlede,
-   author = "Frank-Michael Schlede, Thomas Bär, Andreas Donner",
-   title = "Was ist LDAP (Lightweight Directory Access Protocol)?",
-   year = "2017",
-   note = "https://www.ip-insider.de/was-ist-ldap-lightweight-directory-access-protocol-a-581204/" 
-   }
-   
-   @article{Oracle,
-   author = "Oracle Cooperation",
-   title = "About LDAP",
-   year = "2010",
-   note = "https://docs.oracle.com/cd/E19182-01/820-6573/6nht2e5a4/index.html" 
-   }
-   
 @article{Otto,
    author = "Mark Otto",
    title = "Bootstrap from Twitter",
@@ -152,13 +131,6 @@
    note = "https://djangogirls.org/" 
    }
 
-@article{Microsoft,
-   author = "Microsoft",
-   title = "Extensions for the Visual Studio family of products",
-   year = "2018",
-   note = "https://marketplace.visualstudio.com/" 
-   }
-
 @article{Computer,
    author = "The Computer Language Company",
    title = "Definition of: user permissions",