Dobrucky, B., M. Benova, and P. Spanik. 2009. “Using Complex Conjugated Magnitudes- and Orthogonal Park Clarke Transformation Methods of DC AC AC Frequency Converter”. Elektronika Ir Elektrotechnika 93 (5): 29-34. https://eejournal.ktu.lt/index.php/elt/article/view/10174.