Yun Gao, Jian Gao, Fang-Wei Fu: Quantum codes from cyclic codes over the ring 𝔽<sub>q</sub> + v<sub>1</sub>𝔽<sub>q</sub> + ⋯ + v<sub>r</sub> 𝔽<sub>q</sub>. Appl. Algebra Eng. Commun. Comput. 30(2): 161-174 (2019)