Zakis, J., E. Makovenko, H. Zeng, O. Husev, and L. Kutt. “QZS Inverter As Synchronverter in Small-Scale Micro-Grid”. Elektronika Ir Elektrotechnika, vol. 24, no. 2, Apr. 2018, pp. 58-62, doi:10.5755/j01.eie.24.2.20636.