共 14 条
[2]
*ATA FDN INC, 1992, SURV US 6 COMP COMM
[3]
BUTTON KJ, 1999, INT J TRANSP ECON, V26, P3
[4]
Campbell D.T., 1963, Experimental and quasi-experimental designs for research
[6]
DOYLE E, 1998, FINAL REPORT COMMERC
[9]
MUDGE RR, 1994, ASSESSING TRANSPORTS
[10]
SCHNEIDER LM, 1985, HARVARD BUS REV, V63, P118