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- [1] AVIATION LAWS AND TREATIES OF BULGARIA, THE PEOPLES-REPUBLIC-OF-CHINA, THE CSSR, THE GERMAN-DEMOCRATIC-REPUBLIC, HUNGARY, THE DEMOCRATIC-PEOPLES-REPUBLIC OF KOREA, LAOS, POLAND, ROMANIA, THE USSR, YUGOSLAVIA AND THE REPUBLIC-OF-VIETNAM - KNEIFEL,JL AMERICAN JOURNAL OF INTERNATIONAL LAW, 1986, 80 (04) : 1043 - 1045