@misc{a+prototype+of+a+small+stirling+refrigeration+unit,
    author = {Wrona, Jan i Prymon, Marek},
    title = {A prototype of a small Stirling refrigeration unit},
    journal = {Technical Transactions},
    address = {Kraków},
    publisher = {<a href=\"http://www.wydawnictwo.pk.edu.pl/\" target=\"_blank\">Wydawnictwo PK</a>},
    date = {2018},
    number = {Vol. 115, iss. 7}
}