@misc{the+existence+of+a+weak+solution+of+the+semilinear+first+order+differential+equation+in+a+banach+space,
    author = {Jużyniec, Mariusz},
    title = {The existence of a weak solution of the semilinear first-order differential equation in a Banach space},
    journal = {Technical Transactions},
    address = {Kraków},
    publisher = {<a href=\"http://www.wydawnictwo.pk.edu.pl/\" target=\"_blank\">Wydawnictwo PK</a>},
    date = {2014},
    number = {Y. 111, iss. 2-NP}
}