@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/