%0 Journal Article %T Linear and quasi-linear elliptic equations, by O. Ladyzhenskaya and N. Ural'tseva. Academic Press, New York, 1968. xviii + 495 pages. U.S. $24. %J Canadian mathematical bulletin %D 1969 %P 101-102 %V 12 %N 1 %U http://geodesic.mathdoc.fr/articles/10.1017/S0008439500029994/ %R 10.1017/S0008439500029994 %F 10_1017_S0008439500029994