@article{10_4153_CMB_2002_014_6,
     author = {Marcelo, Agust{\'\i}n and Marcelo, F\'elix and Rodr{\'\i}guez, C\'esar},
     title = {The {Grade} {Conjecture} and the {S} 2 {Condition}},
     journal = {Canadian mathematical bulletin},
     pages = {119--122},
     year = {2002},
     volume = {45},
     number = {1},
     doi = {10.4153/CMB-2002-014-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2002-014-6/}
}