共 25 条
- [3] DAVIE R, 1972, BIRTH 7 REPORT NATIO
- [4] ELLEY WB, 1972, NEW ZEAL J EDUC STUD, V7, P153
- [5] Everitt B., 1977, ANAL CONTINGENCY TAB
- [8] KOLVIN I, 1977, EPIDEMIOLOGICAL APPR, P195
- [9] LANSDOWN RG, 1974, LANCET, V1, P538
- [10] MCGEE R, 1981, SPECIAL SERIES REPOR, V8