Acknowledgments

PAST was inspired by and includes many functions found in PALSTAT (Ryan et al. 1995), which was programmed by P.D. Ryan with assistance from J.S. Whalley. Harper thanks the Danish Natural Science Research Council (SNF) for support. Thanks are also due to Frits Agterberg and Felix M. Gradstein for information and source code for RASC, and Peter Sadler provided source code for CONOP. Jean Guex provided a row of ideas for improvement and extension of the Unitary Associations module, and tested it intensively. John Alroy provided source code for AEO.

Many users of PAST have given us ideas for improvement and reported bugs. Among these are Charles Galea Bonavia, Hans Arne Nakrem, Mikael Fortelius, Knut Rognes, Julian Overnell, Kirsty Brown, Paolo Tomassetti, Jose Luis Navarrete-Heredia, Wally Woolfenden, Erik Tetlie, Fernando Archuby, Ian J. Slipper, James Gallagher, Marcio Pie, Hugo Bucher, Alexey Tesakov, Craig Macfarlane, José Camilo Hurtado Guerrero, Wolfgang Kiessling, Bastien Wauthoz and Claire Imber.

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