@conference{tanaka1987a, title = {A Loudspeaker System with Large Area Diaphragm and Ultra Thin Enclosure (Audio Flat Panel)}, author = {Tanaka, Tsuneo and Takewa, Hiroyuki and Takayama, Satoshi and Serikawa, Mitsuhiko}, booktitle = {Audio Engineering Society Convention 2r}, month = {May}, year = {1987}, url = {https://www.aes.org/e-lib/browse.cfm?elib=4927} }