Affiliation: | 1. Institute of Theoretical Physics, Academia Sinica, P.O. Box 2735, Beijing, People's Republic of China 2. Chemistry Department, Stanford University, 94.305, Stanford, CA, USA 3. Facultad de Ciencias, U.N.E.D., Apartado 60.141, 28.071, Madrid, Spain 4. Chimie Physique, Université Libre de Bruxelles, Campus Plaine, C.P. 231 Boulevard du Triomphe, 1050, Brussels, Belgium
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