@article{02107658,
title = {An elementary proof of the preservation of Lipschitz constants by the Meyer-K\"onig and Zeller operators.},
journal = {JIPAM. Journal of Inequalities in Pure \& Applied Mathematics [electronic only]},
volume = {4},
year = {2003},
zbl = {1078.41018},
language = {en},
url = {http://dml.mathdoc.fr/item/02107658}
}
Trif, Tiberiu. An elementary proof of the preservation of Lipschitz constants by the Meyer-König and Zeller operators.. JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only], Tome 4 (2003) . http://gdmltest.u-ga.fr/item/02107658/