共 50 条
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- [42] 12TH INTERNATIONAL WATER-SUPPLY CONGRESS AND EXHIBITION BUSINESS JAPAN, 1978, 23 (07): : 57 - 57
- [46] 12TH INTERNATIONAL-CONGRESS FOR ELECTRON-MICROSCOPY PTB-MITTEILUNGEN, 1991, 101 (01): : 37 - 37
- [47] 12TH WORLD CONGRESS OF THE INTERNATIONAL ASSOCIATION OF POLITICAL SCIENCES FILOSOFICKY CASOPIS, 1983, 31 (02): : 262 - 269