@misc{class+ii+mechanisms+in+the+construction+of+retractable+roofs,
    author = {Pawlak-Jakubowska, Anita i Romaniak, Krystyna},
    title = {Class II mechanisms in the construction of retractable roofs},
    journal = {Technical Transactions},
    address = {Kraków},
    publisher = {<a href=\"http://www.wydawnictwo.pk.edu.pl/\" target=\"_blank\">Wydawnictwo PK</a>},
    date = {2017},
    number = {Y. 114, vol. 8}
}