ROSENTHAL, P.; SKWARCZYNSKI, M. On a subclass of three-dimensional harmonic functions defined by the Bergman-Whittaker operator. Annales Fennici Mathematici, [S. l.], n. 419, 1968. DOI: 10.5186/aasfm.1968.419. Disponível em: https://afm.journal.fi/article/view/134095. Acesso em: 26 nov. 2024.