1. V. F. Kirichenko, Differential-Geometric Structures on Manifolds (MPSU, Moscow, 2003) [in Russian].
2. N. S. Baklashova, “Some Curvature Properties of lcQS-manifolds,” in Nauchn. trudy MPGU. Ser. Estestv. nauki. Sb. statei (GNO “Prometei,” MPGU, 2006), pp. 25–30.
3. N. S. Baklashova, Structure Equations of LCQS-structures and their Applications, Available from VINITI, No. 935-B2005 (Moscow, 2005).
4. V. F. Kirichenko and L. I. Vlasova, “Concircular Geometry of Nearly Kähler Manifolds,” Matem. Sborn. 193(5), 53–76 (2002).
5. N. S. Sinyukov, Geodesic Mappings of Riemannian Spaces (Nauka, Moscow, 1979) [in Russian].