Optimum Determination of Three-Step Helical Gearboxes for Getting Minimum cross section Dimention
                        Tác giả: Nguyễn Khắc Tuân, Vũ Ngọc Pi
                        Nhà xuất bản: Journal of Environmental Science and Engineering
                                                
                Optimum Determination of Three-Step Helical Gearboxes for Getting Minimum cross section Dimention