@misc{digital+marking+and+hiding+of+information+in+cad+systems,
    author = {Krawczyk, Mariusz},
    title = {Digital marking and hiding of information in CAD systems},
    journal = {Czasopismo Techniczne. Mechanika},
    address = {Kraków},
    publisher = {<a href=\"http://www.wydawnictwo.pk.edu.pl/\" target=\"_blank\">Wydawnictwo PK</a>},
    date = {2008},
    number = {R. 105, Z. 3, 3-M}
}