%0 Journal Article %A Carvalho, F. J.Craveiro de %T Immersed surfaces and pencils of planes in 3-space %J Glasgow mathematical journal %D 1981 %P 133-136 %V 22 %N 2 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500004560/ %R 10.1017/S0017089500004560 %F 10_1017_S0017089500004560