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The authors
Yannis Bassias
(ybassias@amphoren-
ergy.com) is president
of Amphore Energy Inc.,
Houston. Before joining
the petroleum industry he
was associate profes-
sor in the National Museum of Natural
History, Paris. He holds a PhD (1984)
from the University Pierre et Marie Curie,
Paris VI. He is a member of the Ameri-
can Association of Petroleum Geologists,
the Society of Exploration Geophysicists,
the Petroleum Exploration Society of
Great Britain, and the Association of
International Petroleum Negotiators.
Robert Bertagne (rber-
tagne@petromarex.com)
is president of Marex
Inc., Houston. Prior to
joining Marex, he served
in various technical and
managerial positions with
several majors and independent oil
companies.