MathSciNet bibliographic data MR909837 11D68 (11A05) Cao, Zhen Fu; Liu, Rui; Zhang, Liang Rui On the equation $\sum^s_{j=1}(1/x_j)+(1/(x_1\cdots x_s))=1$$\sum^s_{j=1}(1/x_j)+(1/(x_1\cdots x_s))=1$ and Znám's problem. J. Number Theory 27 (1987), no. 2, 206–211. Article

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