D. W. Kim, J. H. Im, S. H. Song, J. Y. Choi, I. Choi, J. W. Ahn, S. C. Lee, D. H.
Lee, 2012, Comparative Study between Two-loop and Single-loop Control of DC/DC Converter
for PVPCS, Journal of the Korean Solar Energy Society, Vol. 32, No. 3, pp. 245-254