%0 Journal Article %A du Plessis, Andrew %T Homotopy classification of regular sections %J Compositio Mathematica %D 1976 %P 301-333 %V 32 %N 3 %I Noordhoff International Publishing %U http://archive.numdam.org/item/CM_1976__32_3_301_0/ %G en %F CM_1976__32_3_301_0