@article{10_4153_CJM_1970_131_6,
     author = {Gilbert, William J.},
     title = {Suspension of the {Lusternik-Schnirelmann} {Category}},
     journal = {Canadian journal of mathematics},
     pages = {1129--1132},
     year = {1970},
     volume = {22},
     number = {6},
     doi = {10.4153/CJM-1970-131-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1970-131-6/}
}