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V. F. Kirichenko, E. A. Pol'kina, “A Criterion for the Concircular Mobility of Quasi-Sasakian Manifolds”, Mat. Zametki, 86:3 (2009), 380–388; Math. Notes, 86:3 (2009), 349–356
V. F. Kirichenko, E. A. Pol'kina, “Geodesic rigidity of certain classes of almost contact metric manifolds”, Izv. Vyssh. Uchebn. Zaved. Mat., 2007, no. 9, 42–49; Russian Math. (Iz. VUZ), 51:9 (2007), 37–44
