@article{10_4153_CMB_1991_036_9,
     author = {Harris, Morton E.},
     title = {On {Extending} {Projectives} of {Finite} {Group-Graded} {Algebras}},
     journal = {Canadian mathematical bulletin},
     pages = {224--228},
     year = {1991},
     volume = {34},
     number = {2},
     doi = {10.4153/CMB-1991-036-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1991-036-9/}
}