%0 Journal Article %A Piccinini, Renzo A. %T Some Results in the Theory of Fibrations %J Canadian mathematical bulletin %D 1977 %P 337-345 %V 20 %N 3 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1977-051-9/ %R 10.4153/CMB-1977-051-9 %F 10_4153_CMB_1977_051_9