J. F. OGILVIE, Centre for Experimental and Constructive Mathematics, Department of Mathematics, Simon Fraser University, 8888 University drive, Burnaby, British Columbia V5A 1S6 Canada; SWEE-LAN CHEAH, YUAN-PERN LEE, Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan; S. P. A. SAUER, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK 2100 Copenhagen O, Denmark.
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