The designations employed and the presentation of the material in this publication do not imply the expression of any opinion whatsoever on the part of the Secretariat of the United Nations concerning the legal status of any country, territory, city or area, or of its authorities, or concerning the delimitation of its frontiers or boundaries.

Mention of any firm, licensed process or commercial products does not imply endorsement by the United Nations.

The views expressed in the papers presented in Parts 2 and 3 are those of the authors and do not necessarily reflect those of the United Nations Secretariat.

Printed at Bangkok, Thailand, August 1999.

This publication has been issued without formal editing.