@article{DAN_1972_202_6_a11,
     author = {Yu. I. Khudak},
     title = {Two inclusion theorems for a method of generalized summation of $T\{\lambda_k\}$ series},
     journal = {Doklady Akademii Nauk},
     pages = {1284--1287},
     publisher = {mathdoc},
     volume = {202},
     number = {6},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_202_6_a11/}
}