@article{00821689,
title = {The generalized Favard problem.},
journal = {Beitr\"age zur Algebra und Geometrie},
volume = {36},
year = {1995},
pages = {185-202},
zbl = {0879.52005},
language = {en},
url = {http://dml.mathdoc.fr/item/00821689}
}
Kripfganz, Anita. The generalized Favard problem.. Beiträge zur Algebra und Geometrie, Tome 36 (1995) pp. 185-202. http://gdmltest.u-ga.fr/item/00821689/