Gečys, S., P. Smolskas, and M. Žmuida. “Application of Parametrical Method Synthesis for Borehole Motors Design”. Elektronika Ir Elektrotechnika, vol. 101, no. 5, Apr. 2010, pp. 9-12, https://eejournal.ktu.lt/index.php/elt/article/view/9387.