@misc{approximation+theorems+for+szasz+mirakjan+durrmeyer+type+operators,
    author = {Herzog, Monika},
    title = {Approximation theorems for Szász-Mirakjan-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}
}