ELST, A. F. M. T.; PRADO, H. Gaussian bounds for reduced heat kernels of subelliptic operators on nilpotent Lie groups. MATHEMATICA SCANDINAVICA, [S. l.], v. 90, n. 2, p. 251–266, 2002. DOI: 10.7146/math.scand.a-14373. Disponível em: https://www.mscand.dk/article/view/14373. Acesso em: 23 apr. 2024.