1. |
A. V. Aminova, S. V. Zuev, D. A. Kalinin, “Algebraic conditions for compatibility of two metrics with a common almost complex (quaternion) structure on a manifold”, Izv. Vyssh. Uchebn. Zaved. Mat., 2000, no. 7, 70–73 ; Russian Math. (Iz. VUZ), 44:7 (2000), 66–69 |