HSIUNG, C.- chih. Some integral formulas for closed hypersurfaces. MATHEMATICA SCANDINAVICA, [S. l.], v. 2, p. 285–293, 1954. DOI: 10.7146/math.scand.a-10415. Disponível em: https://www.mscand.dk/article/view/10415. Acesso em: 30 apr. 2024.