%0 Journal Article %A Schirmer, Helga %T Theory of Retracts, by Sze-Tsen Hu. Wayne State University Press, Detroit, 1965. 234 pages. $13.50. %J Canadian mathematical bulletin %D 1967 %P 145-146 %V 10 %N 1 %U http://geodesic.mathdoc.fr/articles/10.1017/S0008439500027752/ %R 10.1017/S0008439500027752 %F 10_1017_S0008439500027752