%0 Journal Article %A Anderson, R. D. %T Proper homotopies in $l_2$-manifolds %J Compositio Mathematica %D 1971 %P 155-157 %V 23 %N 2 %I Wolters-Noordhoff Publishing %U http://www.numdam.org/item/CM_1971__23_2_155_0/ %G en %F CM_1971__23_2_155_0