Z. Nakutis, R. Ramanauskas, P. Kaskonas, V. Knyva, M. Saunoris, and M. Knyva, “Modeling of Steady State Operation of Two-Input DC-DC Converter for Combining of Harvested and Reserve Powers”, ELEKTRON ELEKTROTECH, vol. 19, no. 9, pp. 57-60, Nov. 2013.