cdef extern from "gsl/gsl_sf_debye.h": double gsl_sf_debye_1(double x) int gsl_sf_debye_1_e(double x, gsl_sf_result * result) double gsl_sf_debye_2(double x) int gsl_sf_debye_2_e(double x, gsl_sf_result * result) double gsl_sf_debye_3(double x) int gsl_sf_debye_3_e(double x, gsl_sf_result * result) double gsl_sf_debye_4(double x) int gsl_sf_debye_4_e(double x, gsl_sf_result * result)
