(4) P. D. Ziogas, et al.: “PWM Control Techniques for Rectifier Filter Minimization”, IEEE Trans. Industr. Applic., IA-21, 1206 (1985)
(5) P. D. Ziogas, et al.: “Optimum System Design of a Three-Phase Rectifier-Inverter Type of Frequency Changer”. IEEE Trans. Industr. Applic., IA-21, 1215 (1985)