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title = {{Fast Gauss transforms with complex parameters using {NFFTs}}},  journal = {Journal of Numerical Mathematics},  }  @article{Keiner_2009,  doi = {10.1145/1555386.1555388},  url = {http://dx.doi.org/10.1145/1555386.1555388},  year = {2009},  month = {aug},  publisher = {Association for Computing Machinery ({ACM})},  volume = {36},  number = {4},  pages = {1--30},  author = {Jens Keiner and Stefan Kunis and Daniel Potts},  title = {{Using {NFFT} 3---A Software Library for Various Nonequispaced Fast Fourier Transforms}},  journal = {{ACM} Trans. Math. Softw.},  }