1. Handbook of Mathematical Functions;Abramowitz,1972
2. An upper bound for the number of equal nonoverlapping spheres that can touch another of the same size;Coxeter,1963
3. Spherical codes and designs;Delsarte;Geometriae Dedicata,1977
4. Bounds for packings on a sphere and in space;Kabatiansky;Problemy Peredači Informacii,1978