Y. J. Wu T. D. Abhayapala Theory and Design of Soundfield Reproduction Using Continuous Loudspeaker Concept. 107-116 2009 17 IEEE Transactions on Audio, Speech & Language Processing 1 http://dx.doi.org/10.1109/TASL.2008.2005340 db/journals/taslp/taslp17.html#WuA09