@conference{harshberger1976a, title = {A Closed-Loop Tape Transport Servo System for Pressure Roller-Less Drive}, author = {Harshberger, Jr., Robert P.}, booktitle = {Audio Engineering Society Convention 55}, month = {Oct}, year = {1976}, url = {https://www.aes.org/e-lib/browse.cfm?elib=2240} }