MathSciNet bibliographic data MR1402616 11L40 (11A07 11D09) Ayyad, Anwar; Cochrane, Todd; Zheng, Zhiyong The congruence $x_1x_2\equiv x_3x_4\pmod p$$x_1x_2\equiv x_3x_4\pmod p$, the equation $x_1x_2=x_3x_4$$x_1x_2=x_3x_4$, and mean values of character sums. J. Number Theory 59 (1996), no. 2, 398–413. Article

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