1. H. Gerischer and F. Willig: in Topics in Current Chemistry, Vol. 61, Ed. by F. Boschke, Springer, Berlin, 1976, p. 31.
2. N. Nakashima, K. Yoshihara, and F. Willig: J. Chem. Phys. 73 (1980) 3553.
3. F. Willig, A. Blumen, and G. Zumofen: Chem. Phys. Lett. 108 (1984) 222.
4. M. Eichhorn, F. Willig, K.-P. Charlé, and K. Bitterling: J. Chem. Phys. 76 (1982) 4648;
5. F. Willig, M. Eichhorn, K.-P. Charlé, and K. Bitterling: J. Electrostatics
12, (1982) 27.