@article{GDZPPN00234744X, title = {On the Solution of the Commutation Relation PQ - QP = -iI.}, journal = {Mathematica Scandinavica}, volume = {13}, year = {1963}, pages = {129-139}, zbl = {0135.36404}, url = {http://dml.mathdoc.fr/item/GDZPPN00234744X} }
Mejlbo, Lars C. On the Solution of the Commutation Relation PQ - QP = -iI.. Mathematica Scandinavica, Tome 13 (1963) pp. 129-139. http://gdmltest.u-ga.fr/item/GDZPPN00234744X/