Please find below material from Buenos Aires and take note the IGU Standard Copyright Clause: “The publications in the below links are issued under the auspices of the INTERNATIONAL GAS UNION (IGU) by the Author(s) cited. The Author(s) and IGU hold joint copyright holders. Irrespective of the above, established journals and periodicals shall be permitted to reproduce all or part of this publication, in abbreviated or edited form, subject to the Author(s) and IGU being credited"