@ARTICLE{Wierzcholski_K._Unified_2013,
 author={Wierzcholski, K.},
 volume={61},
 number={No 2},
 journal={Bulletin of the Polish Academy of Sciences Technical Sciences},
 pages={405-417},
 howpublished={online},
 year={2013},
 title={Unified summation equations and their applications in tribology wear process},
 URL={http://ochroma.man.poznan.pl/Content/83710/PDF/14_paper.pdf},
 doi={10.2478/bpasts-2013-0040},
}