共 11 条
[1]
*CHAS EC ASS, 1976, MACR IMP FED POLL
[2]
CUMBERLAND JH, 1966, REG SCI ASS PAPERS, V17, P56
[3]
*DAT RES INC, 1979, MACR IMP FED POLL
[4]
HAVEMAN RH, 1979, JOBS ENV WORK AM I S
[6]
KETKAR K, 1980, THESIS VANDERBILT U
[8]
RICHARDSON JD, 1975, STUDIES INT ENV EC
[9]
*US BUR LAB STAT, 1975, 1836 B
[10]
*US EPA, 1973, EC CLEAN WAT