@article{shepherd1985an, title = {An Improved Computer Model of Direct-Radiator Loudspeakers}, author = {Shepherd, Ian C. and Alfredson, R. J.}, journal = {J. Audio Eng. Soc}, volume = {33}, number = {5}, pages = {322--329}, year = {1985}, url = {https://www.aes.org/e-lib/browse.cfm?elib=4448} }