Chowdhury, M. M. U. T., M. S. E. Sharif, and F. M. Alamgir. “Design and Simulation of a Dual Conversion Transformerless Online and Line-Interactive UPS”. Dhaka University Journal of Science, vol. 67, no. 2, July 2019, pp. 79-84, doi:10.3329/dujs.v67i2.54577.