@article{10_4153_CJM_1971_068_1,
     author = {Fieldhouse, David J.},
     title = {Characterizations of {Modules}},
     journal = {Canadian journal of mathematics},
     pages = {608--610},
     year = {1971},
     volume = {23},
     number = {4},
     doi = {10.4153/CJM-1971-068-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1971-068-1/}
}