@article{10_4153_CMB_1991_018_0,
     author = {Rupp, Rudolf},
     title = {Stable {Rank} and the {-Equation}},
     journal = {Canadian mathematical bulletin},
     pages = {113--118},
     year = {1991},
     volume = {34},
     number = {1},
     doi = {10.4153/CMB-1991-018-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1991-018-0/}
}