Affiliation: | 1. 30 Belmont Street, Southsea, Hants. PO5 1ND, England;2. Institute for Global Change Research , Frontier Research System for Global Change, SEAVANS North 7F, 1-2-1 Shibaura, Minato-ku, Tokyo, 105-6791, Japan;3. Department of Mathematics , Imperial College of Science, Technology and Medicine , 180 Queen's Gate, London, SW7 2BZ, England;4. Schlumberger, Perforation and Testing Center , P O Box 1590, Rosharon, TX, 77583, USA |