共 50 条
- [35] ULTIMATE DISPOSAL - UNSOLVED PROBLEM EFFLUENT & WATER TREATMENT JOURNAL, 1970, 10 (05): : 271 - &
- [38] TRAINING IN ANGIOLOGY - UNSOLVED PROBLEM VASA-JOURNAL OF VASCULAR DISEASES, 1974, 3 (03): : 349 - 350
- [39] ECHINOCOCCOSIS - PROBLEM STILL UNSOLVED DEUTSCHE GESUNDHEITSWESEN-ZEITSCHRIFT FUR KLINISCHE MEDIZIN, 1979, 34 (21): : 994 - 997