@misc{homotopy+perturbation+method+for+solving+fourth+order+boundary+value+problems+with+additional+boundary+condition,
    author = {Filipowska, Renata},
    title = {Homotopy perturbation method for solving fourth – order boundary value problems with additional boundary condition},
    journal = {Technical Transactions},
    address = {Kraków},
    publisher = {<a href=\"http://www.wydawnictwo.pk.edu.pl/\" target=\"_blank\">Wydawnictwo PK</a>},
    date = {2017},
    number = {Y. 114, vol. 9}
}