Kochenburger, Ralph J. (January 1950). "A Frequency Response Method for Analyzing and Synthesizing Contactor Servomechanisms". Trans. AIEE. 69 (1). American Institute of Electrical Engineers: 270–284. doi:10.1109/t-aiee.1950.5060149. S2CID51646567.
Kochenburger, Ralph J. (January 1950). "A Frequency Response Method for Analyzing and Synthesizing Contactor Servomechanisms". Trans. AIEE. 69 (1). American Institute of Electrical Engineers: 270–284. doi:10.1109/t-aiee.1950.5060149. S2CID51646567.