2016, Kamila Piwowarczyk, Marek Ptak, “ 2 {\displaystyle 2} --hyperreflexivity and hyporeflexivity of power partial isometries”, in arXiv[1]: In the presentpaperit willbeshown that powerpartial isometries are alwayshyporeflexive and 2 {\displaystyle 2} --hyperreflexive.