Gečys, S., and P. Smolskas. “Critical Slip and Characteristics of Induction Motor for Borehole Investigating Devices”. Elektronika ir Elektrotechnika 68, no. 4 (April 19, 2006): 95-98. Accessed October 6, 2022. https://eejournal.ktu.lt/index.php/elt/article/view/10663.