勒让德符号Eisenstein, Berlin: Springer, 2000, ISBN 3-540-66957-4 Ireland, Kenneth; Rosen, Michael, A Classical Introduction to Modern Number Theory(第二版), New York:
輾轉相除法 New York: Springer-Verlag. 1998: 7–11. Rosen, p. 81. Cohn, p. 104. Rosen, p. 91. Schroeder, p. 23. Rosen, pp. 90–93. Koshy T. Elementary Number Theory