@article{10_1017_S0017089500031190,
     author = {Clase, M. V. and Jespers, E. and R{\'\i}o, A. Del},
     title = {Semigroup-graded rings with finite support},
     journal = {Glasgow mathematical journal},
     pages = {11--18},
     year = {1996},
     volume = {38},
     number = {1},
     doi = {10.1017/S0017089500031190},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500031190/}
}