MEJLBO, L. C. On the Solution of the Commutation Relation $PQ - QP = -iI$. MATHEMATICA SCANDINAVICA, [S. l.], v. 13, p. 129–139, 1963. DOI: 10.7146/math.scand.a-10695. Disponível em: https://www.mscand.dk/article/view/10695. Acesso em: 1 may. 2024.