@article{FAA_1991_25_1_a0,
     author = {I. M. Gel'fand and M. I. Graev},
     title = {Crofton's function and inversion formulas in real integral geometry},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {1--6},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1991_25_1_a0/}
}