@book{beitrag+zur+theorie+der+betoneisentraeger,
    author = {Milanković, Milutin},
    title = {Beitrag zur Theorie der Betoneisenträger},
    address = {Wien},
    publisher = {Verlag von Lehmann & Wentzel (Paul Krebs)},
    date = {1905}
}