@book { DiffusionofRenewableEnergyTechnologies,
    title = "Diffusion of Renewable Energy Technologies",
    author = "Christian {Friebe}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03111-9",
    url = "https://www.peterlang.com/document/1047808"
}