@misc{lwow+period+of+s+ulam+s+mathematical+creativity,
    author = {Bazylevych, Lidiya i Guran, Igor i Zarichnyi, Mykhailo},
    title = {Lwów period of S. Ulam’s mathematical creativity},
    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. 2-NP}
}