@electronic{de.wikipedia.org,
   title       = {Datei:LOM base schema.png – Wikipedia}, 
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@electronic{professional-learning.eu,
   title       = {Professional Learning Ontology and Competencies | Professional Learning}, 
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@electronic{www.mpi-inf.mpg.de,
   title       = {Yago - A Core of Semantic Knowledge}, 
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   biburl      = {https://puma.uni-kassel.de/url/e51bc6b721fb0d203039e8fd6f29208c/stumme},
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