1. On a problem of Znám;Qi;Sichuan Daxue Xuebao,1983
2. On the integer xi for which xi|x1 … xi − 1xi + 1 … xn + 1 holds;Janák;Math. Slovaca,1978
3. On the equation Σj = 1s(1xj) + (1(x1 … xs)) = n and the number of solutions of Znám's problem;Qi;Advan. Math.,1986
4. On systems of congruences;Qi;Kexue Tongbao,1983
5. On the representation of 1 by the unit functions;Zhao;Sichuan Daxue Xuebao,1964