@article{1195523138,
author = {Choda, Hisashi and Echigo, Marie},
title = {On theorems of Korovkin},
journal = {Proc. Japan Acad.},
volume = {39},
number = {9},
year = {1963},
pages = { 107-108},
language = {en},
url = {http://dml.mathdoc.fr/item/1195523138}
}
Choda, Hisashi; Echigo, Marie. On theorems of Korovkin. Proc. Japan Acad., Tome 39 (1963) no. 9, pp. 107-108. http://gdmltest.u-ga.fr/item/1195523138/