In: International Energy Markets, edited by Tempest, P. Oelgeschlager, Gunn and Hain, Publishers Inc., Cambridge, USA and Graham and Trotmann Ltd., Publishers, London, UK, 1983, S. 229-238 (mit L. Hoffmann).
In: International Energy Markets, edited by Tempest, P. Oelgeschlager, Gunn and Hain, Publishers Inc., Cambridge, USA and Graham and Trotmann Ltd., Publishers, London, UK, 1983, S. 229-238 (mit L. Hoffmann).