@misc{utilization+of+modern+engineering+tools+for+designing+directional+control+valve,
    author = {Gromala, Przemysław},
    title = {Utilization of modern engineering tools for designing directional control valve},
    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}
}