DENG, Wen. Structure Constants of the Weyl Calculus. Mathematica Scandinavica, Berkeley, CA, United States, v. 112, n. 1, p. 112–128, 2013. DOI: 10.7146/math.scand.a-15236. Disponível em: https://journals.msp.org/mscand/article/view/461. Acesso em: 24 jul. 2026.