Geodesic
Integral geometry in projective space
Funkcionalʹnyj analiz i ego priloženiâ, Tome 4 (1970) no. 1, pp. 14-32 
I. M. Gel'fand; M. I. Graev; Z. Ya. Shapiro. Integral geometry in projective space. Funkcionalʹnyj analiz i ego priloženiâ, Tome 4 (1970) no. 1, pp. 14-32. http://geodesic.mathdoc.fr/item/FAA_1970_4_1_a2/
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] Gelfand I.M., Graev M.I., Shapiro 3.Ya., “Integralnaya geometriya na $k$-mernykh ploskostyakh”, Funkts. analiz, 1:1 (1967), 15–31 | MR

[2] Gelfand I.M., Graev M.I., Shapiro 3.Ya., “Differentsialnye formy i integralnaya geometriya”, Funk. analiz, 3:2 (1969), 24–40 | MR