Popivanov N, Popov T. ESTIMATES FOR THE SINGULAR SOLUTIONS OF THE 3-D PROTTER’S PROBLEM. Ann. Sofia Univ. Fac. Math. and Inf. [Internet]. 2004 Dec. 12 [cited 2025 Jan. 15];96:117-39. Available from: https://admin.uni-sofia.bg/index.php/fmi/article/view/167