TY - JOUR AU - Herstein, I. N. TI - A Note on Derivations II JO - Canadian mathematical bulletin PY - 1979 SP - 509 EP - 511 VL - 22 IS - 4 UR - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1979-066-2/ DO - 10.4153/CMB-1979-066-2 ID - 10_4153_CMB_1979_066_2 ER -