@misc{Dobrzański_L.A._Gradient_2011,
 author={Dobrzański, L.A. and Żukowska, L.W.},
 volume={Vol. 48},
 number={(2) April},
 howpublished={online},
 year={2011},
 publisher={Polish Academy of Sciences},
 title={Gradient PVD coatings deposited on the sintered tool materials},
}