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BesJN(N, X)
BesJN: REAL function, the `KIND=' value of the type being that of argument X.
N: INTEGER not wider than the default kind; scalar; INTENT(IN).
X: REAL; scalar; INTENT(IN).
Intrinsic groups: unix.
Description:
Calculates the Bessel function of the first kind of order N of X.
See bessel(3m), on whose implementation the function depends.