00346nam a22001217a 450000500170000002000180001710000220003524500690005726000320012630000100015849000350016865000210020320260204152826.0  a9783030927233  aFerreira, Rui A C  aDiscrete fractional calculus and fractional difference equations  aSwitzerlandbSpringerc2022  axi+88  aSpringer briefs in mathematics  aLinear equations