@article{DAN_1990_315_2_a14, author = {V. I. Ryazanov}, title = {On the accuracy of some convergence theorems}, journal = {Doklady Akademii Nauk}, pages = {317--319}, publisher = {mathdoc}, volume = {315}, number = {2}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1990_315_2_a14/} }