R. Cimbals, O. Krievs, and L. Ribickis, “A Static Synchronous Compensator for Displacement Power Factor Correction under Distorted Mains Voltage Conditions”, ELEKTRON ELEKTROTECH, vol. 110, no. 4, pp. 71–76, Jun. 2011, doi: 10.5755/j01.eee.110.4.291.