Hongwei Cheng, William Y. Crutchfield, Zydrunas Gimbutas, Leslie Greengard, J. Frank Ethridge, Jingfang Huang, Vladimir Rokhlin, Norman Yarvin, Junsheng Zhao. A wideband fast multipole method for the Helmholtz equation in three dimensions. J. Comput. Physics, 216(1):300-325, 2006. [doi]
Abstract is missing.