Sadeghierad, M., H. Lesani, H. Monsef, and A. Darabi. “Back-Iron Consideration in High-Speed Axial-Flux Machine”. Elektronika Ir Elektrotechnika, vol. 89, no. 1, Jan. 2009, pp. 87-90, https://eejournal.ktu.lt/index.php/elt/article/view/10583.