1. V. I. Abdullin, ?Classification of Riemann spaces V4 admitting of a field of covariantly-constant symmetric tensors,? Tr. Kazan. Aviats. Inst., No. 109, 112?125 (1969).
2. V. I. Abdullin, ?Classification of four-dimensional Riemann spaces admitting of a field of covariantly-constant bivectors,? Uch. Zap. Kazansk. Univ.,129, No. 6, 5?21 (1970).
3. V. I. Abdullin, ?n-Dimensional Riemann spaces admitting of covariantly-constant symmetric tensors of general type. I,? Izv. Vyssh. Uchebn. Zavedenii, Matematika, No. 5, 3?13 (1970).
4. V. I. Abdullin, ?n-Dimensional Riemann spaces admitting of covariantly-constant symmetric tensors of general type. II,? Izv. Vyssh. Uchebn. Zavedenii, Matematika, No. 6, 3?15 (1970).
5. V. I. Abdullin, ?Classification of S-spaces of base type,? Tr. Seminara Kafedry Geometrii, Kazansk. Univ., No. 6, 5?21 (1971).