Ma, J., Man, K.L., Zhang, N., Guan, S.U., Wong, P.W., Lim, E.G., Krilavicius, T., Kapociute-Dzikiene, J. and Lei, C.U. 2013. Improving Power-Conversion Efficiency via a Hybrid MPPT Approach for Photovoltaic Systems. Elektronika ir Elektrotechnika. 19, 7 (Sep. 2013), 57-60. DOI:https://doi.org/10.5755/j01.eee.19.7.5163.