TY  - JOUR
AU  - Peter Semrl
TI  - On ring derivations and quadratic functionals.
JO  - Aequationes mathematicae
PY  - 1991
SP  - 80
EP  - 84
VL  - 42
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AM2_1991__42_3_137420/
ID  - AM2_1991__42_3_137420
ER  -