Ozcelik, M. A., A. S. Yilmaz, S. Kucuk, and M. Bayrak. “Efficiency in Centralized DC Systems Compared With Distributed DC Systems in Photovoltaic Energy Conversion”. Elektronika Ir Elektrotechnika, vol. 21, no. 6, Dec. 2015, pp. 51-56, doi:10.5755/j01.eee.21.6.13761.