@article{Sierociuk_D._Duality_2014,
 author={Sierociuk, D. and Twardy, M.},
 volume={62},
 number={No 4},
 howpublished={online},
 journal={Bulletin of the Polish Academy of Sciences: Technical Sciences},
 pages={809-815},
 year={2014},
 title={Duality of variable fractional order difference operators and its application in identification},
 doi={10.2478/bpasts-2014-0089},
}