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+/*
+ * Recursive computation of (arbitrary degree) spherical Bessel/Neumann/Hankel functions,
+ * according to Gumerov and Duraiswami,
+ * "The Fast Multipole Methods for the Helmholtz Equation in Three Dimensions",
+ * Elsevier, 2005.
+ *
+ * Implementation by Franz Zotter, Institute of Electronic Music and Acoustics
+ * (IEM), University of Music and Dramatic Arts (KUG), Graz, Austria
+ * http://iem.at/Members/zotter, 2007.
+ *
+ * This code is published under the Gnu General Public License, see
+ * "LICENSE.txt"
+ */
+
+#ifndef __SPH_RADIAL_H__
+#define __SPH_RADIAL_H__
+
+void sphBessel (double x, double *y, int n);
+
+void sphNeumann (double x, double *y, int n);
+
+void sphBesselDiff (double x, double *y, int n);
+
+void sphNeumannDiff (double x, double *y, int n);
+
+#endif // __SPH_RADIAL_H__