@misc{technical+transactions+iss+21+mechanics+iss+3+m,
    title = {Technical Transactions iss. 21. Mechanics iss. 3-M},
    address = {Kraków},
    publisher = {<a href=\"http://www.wydawnictwo.pk.edu.pl/\" target=\"_blank\">Wydawnictwo PK</a>},
    date = {2015}
}