@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/