References
- Stark , H. M. 1987 . An Introduction to Number Theory , Cambridge, MA : MIT Press .
- Haggard , P. W. 1991 . The Journal of the Elisha Mitchell Scientific Society, , 107 (1) : 56 – 60 .
- Haggard , P. W. and Morales , K. L. 1993 . Int. J. Math. Educ. Sci. Technol., , 24 : 85 – 90 .