@misc{designing+of+structural+systems+with+application+of+principle+of+superposition,
    author = {Rębielak, Janusz},
    title = {Designing of structural systems with application of principle of superposition},
    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. 8-A}
}