1. Stepping Motors: a guide to theory and practice
2. Xu, D. and Jiang, Y. “A method and implementation of fully digitized continuous microstep for step motor,”. IEEE International Electric Machines and Drives Conference (IEMDC97). 18–21 May. pp.TC2/9.1–TC2/9.3. Milwaukee, WI
3. Applications of the closed-loop stepping motor
4. Kuo, B. C. “Closed-loop and speed control of step motors,”. 3rd Annual Symposium on Incremental Motion Control Systems and Devices. 6–8 May. Urbana-Champaign, IL
5. Simple algorithm for closed-loop control of stepping motors