Ueno, Seitarô (1955), "On the densities in a two-dimensional generalized space", Memoirs of the Faculty of Science, 9: 65–77, doi:10.2206/kyushumfs.9.65, MR0071801
Ueno, Seitarô (1955), "On the densities in a two-dimensional generalized space", Memoirs of the Faculty of Science, 9: 65–77, doi:10.2206/kyushumfs.9.65, MR0071801
Izrail Moiseevich Gel'fand; Mark Iosifovich Graev (1991), "Crofton's function and inversion formulas in real integral geometry", Functional Analysis and Its Applications, 25: 1–5, doi:10.1007/BF01090671, S2CID24484682
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Izrail Moiseevich Gel'fand; Mark Iosifovich Graev (1991), "Crofton's function and inversion formulas in real integral geometry", Functional Analysis and Its Applications, 25: 1–5, doi:10.1007/BF01090671, S2CID24484682