1. Divisibility properties of the q-tangent numbers;Andrews;Proc. Amer. Math. Soc.,1978
2. Congruences for the q-secant numbers;Andrews;Eur. J. Combin.,1981
3. Orthogonal polynomials and special functions, Regional conference series in applied math. no. 21;Askey,1975
4. q-Bernoulli numbers and polynomials;Carlitz;Duke Math. J.,1948
5. Chu Shih-Chieh, Ssu Yuan Yü Chien, 1303 (en chinois), cf. [3].