共 50 条
- [3] RECOMBINANT DNA - PROSPECT OF NEW UNITED-STATES REGULATION [J]. NATURE, 1984, 310 (5979) : 613 - 613
- [5] UNITED-STATES EXTENDS RECOMBINANT DNA CONTROLS TO PRIVATE INDUSTRY [J]. NATURE, 1978, 276 (5690) : 744 - 744
- [8] EXPECTED FERTILITY AND DIFFERENTIAL FERTILITY IN THE UNITED-STATES [J]. POPULATION, 1964, 19 (01): : 143 - 146