1. 0ber die Ganzzahligkeit der Atomgewicht und verwandte Fragen;von Mises;Phys. Z.,1918
2. On the construction of significance tests on the circle and the sphere;Watson;Biometrika,1956
3. Circular Statistics in Biology;Batschelet,1981
4. Statistical Analysis of Spherical Data;Fisher,1987
5. Directional Statistics;Mardia,2000