共 6 条
- [1] BARNARD PD, 1956, 8 NAT HLTH MED RES C
- [2] KNUTSON J W, 1958, J Am Dent Assoc, V57, P821
- [3] Knutson John W., 1944, PUBL HEALTH REPTS, V59, P253, DOI 10.2307/4584789
- [4] SOEMANTRI RAS, 1959, 2ND WHO DENT HLTH SE
- [5] 1959, 2ND SEM DENT HLTH MA
- [6] 1959, WHO WPRO24 REPT