@article{amemiya1955an, title = {An Extended Cathode-Coupled Phase Inverter and Its Application to Single-Ended Push-Pull Amplifiers}, author = {Amemiya, Hiroshi}, journal = {J. Audio Eng. Soc}, volume = {3}, number = {2}, pages = {82--86}, year = {1955}, url = {https://www.aes.org/e-lib/browse.cfm?elib=24} }