@misc{torsion+of+precast+hollow+core+slabs,
    author = {Derkowski, Wit i Surma, Mateusz},
    title = {Torsion of precast hollow core slabs},
    journal = {Technical Transactions},
    address = {Kraków},
    publisher = {<a href=\"http://www.wydawnictwo.pk.edu.pl/\" target=\"_blank\">Wydawnictwo PK</a>},
    date = {2015},
    number = {Y. 112, iss. 3-B}
}