@article{GDZPPN002039427,
title = {On reduction of linear two variable functional equations to differential equations without substitutions.},
journal = {Aequationes mathematicae},
volume = {44},
year = {1992},
pages = {236-247},
zbl = {0755.39005},
url = {http://dml.mathdoc.fr/item/GDZPPN002039427}
}
Páles, Zsolt. On reduction of linear two variable functional equations to differential equations without substitutions.. Aequationes mathematicae, Tome 44 (1992) pp. 236-247. http://gdmltest.u-ga.fr/item/GDZPPN002039427/