1. A. Adelberg, S. F. Hong, W. L. Ren, Bounds of divided universal Bernoulli numbers and universal Kummer congruences, Proc. Amer. Math. Soc., 136 (2008), 61–71.
2. M. Aoki, T. Komatsu, Remarks on hypergeometric Cauchy numbers, Math. Rep. (Bucur.), 22 (2020), 363–380.
3. R. Barman, T. Komatsu, Lehmer's generalized Euler numbers in hypergeometric functions, J. Korean Math. Soc., 56 (2019), 485–505.
4. F. Brioschi, Sulle funzioni Bernoulliane ed Euleriane, Annali di Mat., i (1858), 260-263
5. Opere Mat., i (1858), 343-347.