SKOVHUS POULSEN, Niels. On the Canonical Commutation Relations. Mathematica Scandinavica, Berkeley, CA, United States, v. 32, p. 112–122, 1973. DOI: 10.7146/math.scand.a-11448. Disponível em: https://journals.msp.org/mscand/article/view/2162. Acesso em: 25 jul. 2026.