@article{10_4153_CJM_1988_002_0,
     author = {Sunder, V. S.},
     title = {N {Subspaces}},
     journal = {Canadian journal of mathematics},
     pages = {38--54},
     year = {1988},
     volume = {40},
     number = {1},
     doi = {10.4153/CJM-1988-002-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1988-002-0/}
}