@book { ModelDrivenSoftwareDevelopmentUsingaMetamodelBasedExtensionMechanismforUML,
    title = "Model-Driven Software Development Using a Metamodel-Based Extension Mechanism for UML",
    author = "Ralf {Gitzel}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1101151"
}