A. S. Barrak, A. A. M. Saleh, and Z. H. Naji, “A Heat Recovery Device using Oscillating Heat Pipe with Circular and Elliptical Tubes”, Int. J. Automot. Mech. Eng., vol. 18, no. 1, pp. 8442 – 8453, Mar. 2021, doi: 10.15282/ijame.18.1.2021.04.0639.