4Perera L A R, Amin A T M N, Accommodat- ing the informal Sector: A Strategy for Urban Environmental Managerrent[J]. Journal of Environmental Management.1996,(46):3-15.
5Bromley R. Street Vending and Public Policy: A Global Review[J]. Interna tional Journal of Sociology and Social Policy,2000,(1/2):1-29.
6Bruce B. Nel Etienne, Government Re trading: The Peoples' Mall. Port of Spain, Trinidad[J] Geography, 1993,(3):315-318.
7Harrison M, MCVey C. Conflict in the City:Street Trading in Mexico City [J]. Third World Planning Review 1997,(19):313-326.
8Pena S. Regulating Informal Markets: Informal Commerce in Mexico City[J].Informal Jourmal of Sociolkgy and Social Policy,2000,(9/10):37-66.
