1. V. N. Abdullin, ?n-dimensional Riemannian spaces that admit covariantly constant symmetric tensor fields of general type. I,?Izv. Vyssh. Uchebn. Zaved., Mat., No. 5, 3?13 (1970).
2. V. N. Abdullin, ?n-dimensional Riemannian spaces that admit covariantly constant symmetric tensor fields of general type. II,?Izv. Vyssh. Uchebn. Zaved., Mat., No. 6, 3?15 (1970).
3. D. V. Beklemishev, ?Differential geometry of spaces with almost complex structure,? in:Geometry 1963 [in Russian], Progress in Science, VINITI AN SSSR, Moscow (1965), pp. 165?212.
4. M. Vasileva, ?Decomposition of generalized B-curvature tensor fields,?Plovdiv. Univ. Nauchn. Trud. 19, No. 1, 387?397 (1981).
5. M. Vasileva, ?B-manifolds with constant holomorphic curvature of 4-dimensional holomorphic subspaces,?Plovdiv. Univ. Nauchn. Trud. 20, No. 1, 251?263 (1982).