@book { TowardsaKnowledgeBasedSocietyinEurope,
    title = "Towards a Knowledge-Based Society in Europe",
    subtitle = "10 th  International Conference on Policies of Economic and Social Development, Sofia, October 5 to 7, 2007",
    author = " {Chobanov} and Jürgen {Plöhn} and Horst {Schellhaass}",
    year = "2009",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1106919"
}