%0 Journal Article %A Yahya, Q.A.M.M. %T Fermat's last theorem - a topological verification %J Portugaliae mathematica %D 1977 %P 25-31 %V 36 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1977__36_1_115299/ %G en %F PORMA_1977__36_1_115299