@misc{ant+colony+opimization+algorithms+for+clustering+problems,
    author = {Schiff, Krzysztof},
    title = {Ant colony opimization algorithms for clustering problems},
    journal = {Technical Transactions},
    address = {Kraków},
    publisher = {<a href=\"http://www.wydawnictwo.pk.edu.pl/\" target=\"_blank\">Wydawnictwo PK</a>},
    date = {2013},
    number = {Y. 110, iss. 4-AC}
}