@article{ELMA_1983__38_141316,
     author = {Richard L. Rubin},
     title = {Linear operators satisfying the chain rule.},
     journal = {Elemente der Mathematik},
     pages = {93--95},
     year = {1983},
     volume = {38},
     zbl = {0542.44005},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1983__38_141316/}
}