@conference{penkov1991overheat, title = {Overheat Protection Circuits for Moving-Coil Loudspeakers}, author = {Penkov, Georgi and Valtchev, Plamen}, booktitle = {Audio Engineering Society Convention 90}, month = {Feb}, year = {1991}, url = {https://www.aes.org/e-lib/browse.cfm?elib=5657} }