MathSciNet bibliographic data MR920300 65D20 (33A40 65-04) Thompson, I. J.; Barnett, A. R. Modified Bessel functions $I_\nu(z)$$I_\nu(z)$ and $K_\nu(z)$$K_\nu(z)$ of real order and complex argument, to selected accuracy. Comput. Phys. Comm. 47 (1987), no. 2-3, 245–257. Article

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