@book { UnderstandigClassicalHomeopathy,
    title = "Understandig Classical Homeopathy",
    author = "Heidi {Grollmann} and Urs {Maurer} and Hans G. {Schrauder}",
    year = "2021",
    publisher = "Gromaverlag",
    address = "Baar, Deutschland",
    url = "https://ebooks.gromaverlag.ch/document/1139002"
}