Function: double gsl_sf_coupling_9j(int two_ja, int two_jb, int two_jc, int two_jd, int two_je, int two_jf, int two_jg, int two_jh, int two_ji)
Function: int gsl_sf_coupling_9j_e(int two_ja, int two_jb, int two_jc, int two_jd, int two_je, int two_jf, int two_jg, int two_jh, int two_ji, gsl_sf_result * result)
These routines compute the Wigner 9-j coefficient,
where the arguments are given in half-integer units, @math{ja} =
two_ja/2, @math{ma} = two_ma/2, etc.