Omonigho, O. M. “Further Results on Stability Criteria for Certain Second-Order Delay Differential Equations With Mixed Coefficients: Further Results on Stability Criteria for Certain Second-order. ”. Journal of the Nigerian Mathematical Society, vol. 42, no. 1, Apr. 2023, pp. 36-48, https://ojs.ictp.it/jnms/index.php/jnms/article/view/875.