Keedy, Mervin L., author
Addison-Wesley, 1966
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Ireland, Kenneth F., author
Springer-Verlag, 1990
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Adams, William W., author
Prentice-Hall, 1976
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Flath, Daniel E., author
John Wiley & Sons, 1989
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Davenport, Harold
Springer-Verlag , 1980
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