@article{10_1017_S001708950000567X,
     author = {Fong, C. K.},
     title = {Range inclusion for normal derivations},
     journal = {Glasgow mathematical journal},
     pages = {255--262},
     year = {1984},
     volume = {25},
     number = {2},
     doi = {10.1017/S001708950000567X},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S001708950000567X/}
}