Hello people, I have recently entered a Mechanical Engineering course (first semester) and I have a seminar to present about variators of velocity. I have a very rough idea of what they are, but I need more reference o go further. I don't need very technical details, just a deeper overview of it and I was hoping you could help. Is there any webpage, pdf or book I can check for deeper knowledge? I have tried googling already, but most I find are manuals to models of variators, which is not exactly I want. Thanks in advance.