@article{TRSPY_1965_86_a0,
     author = {S. B. Stechkin and P. L. Ul'yanov},
     title = {Sequences of convergence for series},
     journal = {Informatics and Automation},
     pages = {3--83},
     publisher = {mathdoc},
     volume = {86},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1965_86_a0/}
}