@article{desper1970design, title = {Design Innovations in a Portable Sound Reinforcement System}, author = {Desper, Stephen and Bennett, R. L.}, journal = {J. Audio Eng. Soc}, volume = {18}, number = {6}, pages = {667--670}, year = {1970}, url = {https://www.aes.org/e-lib/browse.cfm?elib=1457} }