@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} }