V. Sergeev, Vyacheslav, Yuri M. Lyashenko, Kazbek K. Mulukhov, and Mikhail V. Gegelashvily. 2018. “Classification of Cargo Lifting Machines and Mechanisms”. International Journal of Engineering & Technology 7 (2.13): 1-6. https://doi.org/10.14419/ijet.v7i2.13.11569.