@ARTICLE{Ostalczyk_P._Remarks_2014, author={Ostalczyk, P.}, volume={62}, number={No 2}, journal={Bulletin of the Polish Academy of Sciences Technical Sciences}, pages={271-278}, howpublished={online}, year={2014}, title={Remarks on five equivalent forms of the fractional – order backward – difference}, URL={http://journals.pan.pl/Content/83905/PDF/08_paper.pdf}, doi={10.2478/bpasts-2014-0027}, }