Gowthaman, K. .; Gupta, S.; Mohan, C.; Guenda, K.; Chinnapillai, . . D. . . Cyclic DNA Codes over the Ring $\mathbb{Z}_4+u\mathbb{Z}_4+u^2\mathbb{Z}_4$. J. Algebra Comb. Discrete Struct. Appl. 2021, 8, 219-231.