POPIVANOV, N.; POPOV, T. ESTIMATES FOR THE SINGULAR SOLUTIONS OF THE 3-D PROTTER’S PROBLEM. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 96, p. 117–139, 2004. Disponível em: https://ftl5.uni-sofia.bg/index.php/fmi/article/view/167. Acesso em: 24 nov. 2024.