Ramonas, C., V. Adomavicius, and S. Gecys. “Research of Harmonic Minimization Possibilities in Grid-Tied Photovoltaic System”. Elektronika Ir Elektrotechnika, vol. 107, no. 1, Jan. 2011, pp. 83-86, https://eejournal.ktu.lt/index.php/elt/article/view/9093.