@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/