Siegl, Jürgen, Irfan Syarief Arief, and Akbar Rizqi Hartawan. “nalysis of nergy fficiency of otate lettner otor ased on ariation in ind irection and Rotor’s aterial”. International Journal of Marine Engineering Innovation and Research 5, no. 2 (July 10, 2025): 92–101. ccessed December 6, 2025. https://journal.its.ac.id/index.php/ijmeir/article/view/6009.