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https://stackoverflow.com/questions/2443790/uml-class-diagram-for-user-login
https://creately.com/diagram/example/i7vhibg01/User%20Login%20System
https://creately.com/diagram/example/harn5g1o/Login%20system
https://creately.com/diagram/example/itcpcoym2/Login-System
https://repository.genmymodel.com/examples/User-Login
https://softwareengineering.stackexchange.com/questions/359486/how-to-model-two-step-login-in-uml-via-use-cases-and-sequence-diagrams-properly
https://www.uml-diagrams.org/index-examples.html
http://www.comsis.org/pdf.php?id=115-0809
https://www.pinterest.de/pin/450148925234759090/
https://www.lucidchart.com/pages/how-to-draw-a-sequence-diagram-in-UML
https://www.lucidchart.com/pages/de/was-ist-ein-uml-diagramm
https://www.smartdraw.com/uml-diagram/
http://csis.pace.edu/~marchese/CS389/L9/Use%20Case%20Diagrams.pdf