MathSciNet bibliographic data MR884454 11D04 Sun, Qi; Wan, Da Qing On the solvability of the equation $\sum^n_{i=1}x_i/d_i\equiv 0\;({\rm mod}\,1)$$\sum^n_{i=1}x_i/d_i\equiv 0\;({\rm mod}\,1)$ and its application. Proc. Amer. Math. Soc. 100 (1987), no. 2, 220–224. Article

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