共 50 条
- [43] Preparing for the twenty-first century. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 1997, 213 : 14 - SCHB
- [49] A world challenged. Fighting terrorism in the twenty-first century. OSTEUROPA, 2005, 55 (02): : 133 - 134
- [50] Six billion plus: World population in the twenty-first century. PROFESSIONAL GEOGRAPHER, 2007, 59 (03): : 402 - 404