@article{GDZPPN00208080X,
title = {Linear operators satisfying the chain rule.},
journal = {Elemente der Mathematik},
volume = {38},
year = {1983},
pages = {93-95},
zbl = {0542.44005},
url = {http://dml.mathdoc.fr/item/GDZPPN00208080X}
}
Rubin, Richard L. Linear operators satisfying the chain rule.. Elemente der Mathematik, Tome 38 (1983) pp. 93-95. http://gdmltest.u-ga.fr/item/GDZPPN00208080X/