1. Amos, D.E.: Algorithm 644: a portable package for Bessel functions of a complex argument and nonnegative order. ACM Trans. Math. Softw. 3, 265–273 (1986)
2. Bochner, S., Martin, W.: Several Complex Variables. Princeton University Press, Princeton (1948)
3. Bremer, J.: On the numerical calculation of the roots of special functions satisfying second order ordinary differential equations. SIAM J. Sci. Comput. 39, A55–A82 (2017)
4. Bremer, J.: On the numerical solution of second order differential equations in the high-frequency regime. Appl. Comput. Harmon. Anal. To appear (2017)
5. Bremer, J., Rokhlin, V.: Improved estimates for nonoscillatory phase functions. Discrete and Continuous Dynamical Systems, Series A 36, 4101–4131 (2016)