@article{10_1017_S0017089500007679,
     author = {Wenying, Feng and Guoxing, Ji},
     title = {A {Counterexample} in the theory of derivations},
     journal = {Glasgow mathematical journal},
     pages = {161--163},
     year = {1989},
     volume = {31},
     number = {2},
     doi = {10.1017/S0017089500007679},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500007679/}
}