Rajagopal, Jeetendra, and Jeevanandan Balamurugan. “Enhanced Results on Stability Criteria for Linear Time Delay Systems With Distributed Delay via Relaxed Double Integral Inequality”. Advances in Systems Science and Applications, vol. 21, no. 1, Mar. 2021, pp. 86-94, doi:10.25728/assa.2021.21.1.1044.