@misc{approximation+of+functions+of+several+variables+by+the+baskakov+durrmeyer+type+operators,
    author = {Krech, Ireneusz i Malejki, Renata},
    title = {Approximation of functions of several variables by the Baskakov-Durrmeyer type operators},
    journal = {Technical Transactions},
    address = {Kraków},
    publisher = {<a href=\"http://www.wydawnictwo.pk.edu.pl/\" target=\"_blank\">Wydawnictwo PK</a>},
    date = {2016},
    number = {Y. 113, iss. 1-NP}
}