%0 Journal Article %A G. Fichera %T Francesco Giacomo Tricomi (on his ninetieth birthday) %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1987 %V 42 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1987_42_3_a23/ %G ru %F RM_1987_42_3_a23