%0 Journal Article %A W.W. Boone %A H., Jr. Rogers %T On a Problem of J.H.C. Whitehead and a Problem of Alonzo Church. %J Mathematica Scandinavica %D 1966 %P 185-192 %V 19 %I mathdoc %U http://geodesic.mathdoc.fr/item/MS2_1966__19_165969/ %F MS2_1966__19_165969