@article{burwen19631, title = {1 Kilowatt Transistor Audio Amplifier}, author = {Burwen, Richard S.}, journal = {J. Audio Eng. Soc}, volume = {11}, number = {1}, pages = {34--40}, year = {1963}, url = {https://www.aes.org/e-lib/browse.cfm?elib=823} }