@misc{two+constructions+of+ie4+efficiency+class+synchronous+motors+with+distributed+and+concentrated+winding,
    author = {Herbst, Andrzej},
    title = {Two constructions of IE4 efficiency class synchronous motors with distributed and concentrated winding},
    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. 1-E}
}