共 50 条
- [46] Twenty-five years ago: Then and now JOURNAL OF FAMILY PLANNING AND REPRODUCTIVE HEALTH CARE, 2001, 27 (03): : 177 - 177
- [48] Eradication of smallpox, twenty years ago now BULLETIN DE L ACADEMIE NATIONALE DE MEDECINE, 2000, 184 (01): : 89 - 104