1. E. Hille and R. S. Phillips, Functional Analysis and Semigroups, Amer. Math. Soc., Providence (1957).
2. V. I. Semyanistyi, ?Some integral transforms and integral geometry in an elliptic space,? Trudy Sem. Vektor. Tenzor. Anal.,12, 397?441 (1963).
3. V. G. Chernov, ?The Radon transform in an affine space over a locally compact disconnected continuous field,? Uchen. Zap. MOPI, Issue 262, No. 13, 236?255 (1985).
4. J. P. S. Kung, ?The Radon transforms of a combinatorial geometry, I,? J. Combin. Theory Ser. A,26, 97?102 (1979).
5. Contemp. Math.;J. P. S. Kung,1986