Bundschuh Peter; Ji Chungang; Shan Zun: A remarkable class of congruences. In: Acta scientiarum mathematicarum, (67) 3-4. pp. 493-500. (2001)
Chen Yong-Gao; Ji Chungang: The number of multinomial coefficients not divided by a prime. In: Acta scientiarum mathematicarum, (64) 1-2. pp. 37-48. (1998)