@misc{technical+transactions+iss+20+environment+engineering+iss+1+s,
    title = {Technical Transactions iss. 20. Environment Engineering iss. 1-Ś},
    address = {Kraków},
    publisher = {<a href=\"http://www.wydawnictwo.pk.edu.pl/\" target=\"_blank\">Wydawnictwo PK</a>},
    date = {2014}
}