V. I. Panzhenskii, T. R. Klimova, “The contact metric connection with skew torsion”, Izv. Vyssh. Uchebn. Zaved. Mat., 2019, no. 11, 54–63; Russian Math. (Iz. VUZ), 63:11 (2019), 47–55
V. I. Panzhenskii, T. R. Klimova, “The contact metric connection on the Heisenberg group”, Izv. Vyssh. Uchebn. Zaved. Mat., 2018, no. 11, 51–59; Russian Math. (Iz. VUZ), 62:11 (2018), 45–52
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