Soto Berumen, Luís Humberto, Jorge L. Moya Rodríguez, Ángel Machado Rodríguez, and José Alberto Velázquez Pérez. 2007. “Improvement of Worm Gear Design to Contact Stresses”. Centro Azúcar Journal 34 (1). http://centroazucar.uclv.edu.cu/index.php/centro_azucar/article/view/547.