@article{GDZPPN002422786,
title = {Determination of Korovkin Closures.},
journal = {Mathematische Zeitschrift},
volume = {166},
year = {1979},
pages = {263-274},
zbl = {0393.46027},
url = {http://dml.mathdoc.fr/item/GDZPPN002422786}
}
Bauer, Heinz; Leha, G.; Papadopoulou, S. Determination of Korovkin Closures.. Mathematische Zeitschrift, Tome 166 (1979) pp. 263-274. http://gdmltest.u-ga.fr/item/GDZPPN002422786/