1. B. Abakirov, ?Some transformation groups in Riemannian spaces with degeneracy fields,? in:Studies in Topology and Geometry [in Russian], Frunze (1985), pp. 3?6.
2. B. Abakirov and D. Moldobaev, ?Some problems about groups of conformai mappings of Riemannian spaces,?Sb. Tr. Aspirantov i Soiskatelei (Collection of Papers by Graduate Students and Research Assistants), Kirg. Univ. Ser. Mat. Nauk,10, 3?7 (1973).
3. G. B. Abakirova, ?On intransitive groups of conformai mappings in four-dimensional spaces with degeneracy fields,? in:Studies in Topology and Geometry [in Russian], Frunze (1985), pp. 6?14.
4. D. V. Alekseevskii, ?Groups of conformai mappings of Riemannian spaces,?Mat. Sb.,89, No. 2, 280?296 (1972).
5. D. V. Alekseevskii, ?S n andE n are the only Riemannian spaces admitting an essential conformai mapping,?Usp. Mat. Nauk,28, No. 5, 225?226 (1973).