共 54 条
[22]
HANSMANN HB, 1996, STRUCTURE OWNERSHIP
[24]
Hausman JA, 1997, BROOKINGS PAP ECO AC, P1
[26]
Heinen A, 2002, EURO MONOGR, V34, P259
[27]
KATZ ML, 1991, MICROECONOMICS, P482
[29]
Laffont J. J., 2001, Competition in Telecommunications