A Class of Analytically Uncontinuable Series in Orthogonal Polynondals. P. RUSSEV — 1970 Mathematische Annalen
Nikola Obreshkoff - Bibliography Russev, P. — 1996 Serdica Mathematical Journal Biographical data This year marks the centennial of the birth of Academician Nikola Obreshkoff, a distinguished Bulgarian mathematician of world recognition.