• Power quality issues in dispersed generation and smart gridsVaimann, Toomas; Niitsoo, Jaan; Kivipõld, Tanel; Lehtla, TõnuElektronika ir elektrotechnika = Electronics and electrical engineering2012 / p. 23-26 : ill https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&doi=573c03a0753bcfce3929ba739ff032b16882acf5