1. Huang K, Yang CN (1957) Quantum-mechanical many-body problem with hard-sphere interaction. Phys Rev 105: 767–775
2. Liu L, Wong KW (1963) Bose system of hard spheres. Phys Rev 132: 1349–1353
3. Albeverio S, Gesztesy F, Hoegh-Krohn R, Holden H (2005) Solvable models in quantum mechanics. Springer, New York
4. Demkov Yu, Ostrovskii VN (1989) Zero-range potentials and their applications in atomic physics. Plenum, New York
5. Abramowitz M, Stegun I (1965) Handbook of mathematical functions. Dover, New York