MathSciNet bibliographic data MR2492364 (2009m:11046) 11D79 (11A05 11A25) Ustinov, A. V. On the number of solutions of the congruence $xy\equiv l\pmod q$$xy\equiv l\pmod q$ under the graph of a twice continuously differentiable function. (Russian) Algebra i Analiz 20 (2008), no. 5, 186--216; translation in St. Petersburg Math. J. 20 (2009), no. 5, 813–836 Article

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