DLMF: 10.9 Integral Representations
For collections of integral representations of Bessel and Hankel functions see Erdélyi et al. (1953b, 7.3 and 7.12), Erdélyi et al. (1954a, pp. 43–48, 51–60, 99–105, 108–115, 123–124, 272–276, and 356–357), Gröbner and Hofreiter (1950, pp. 189–192), Maric...