Book:Murray R. Spiegel/Mathematical Handbook of Formulas and Tables/Chapter 24

Recurrence Formulas for Modified Bessel Functions
=== Modified Bessel Functions of Order equal to Half an Odd Integer ===

$\operatorname {Ker}$ and $\operatorname {Kei}$ Functions
=== Differential Equation for $\operatorname {Ber}$, $\operatorname {Bei}$, $\operatorname {Ker}$, $\operatorname {Kei}$ Functions ===