1. Albrecht, W., et al.: DESY Preprint 69146 (1969).
2. Bardacki, K., Segrè, G.: Phys. Rev. 159, 1263 (1967).
3. Bateman Manuscript Project: Vol.I, Chapter VI. New York: McGraw-Hill 1900.
4. Bateman Manuscript Project: Vol.I, Chapter VI, 19.255. New York: McGraw-Hill 1900.
5. Bateman Manuscript Project: Vol.I, Chapter VI, 19.253. New York: McGraw-Hill 1900.