@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} }