@misc{preface,
    author = {Węcławowicz-Gyurkovich, Ewa i Kadłuczka, Andrzej},
    title = {Preface},
    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. 7-A}
}