PREYGER, David, and Vladimir OMELCHENKO. “CASPIAN DILEMMA: HOW TO DELIVER BLUE FUEL TO THE EUROPEAN MARKET”.
CENTRAL ASIA AND THE CAUCASUS
6, no. 3 (June 30, 2005): 120–128. Accessed June 30, 2025.
https://ca-c.org/index.php/cac/article/view/782
.