int gsl_sf_debye_1_e(double x,double* result);
double gsl_sf_debye_1(double x);
int gsl_sf_debye_2_e(double x,double* result);
double gsl_sf_debye_2(double x);
int gsl_sf_debye_3_e(double x,double* result);
double gsl_sf_debye_3(double x);
int gsl_sf_debye_4_e(double x,double* result);
double gsl_sf_debye_4(double x);