4Vytautas Snie ka,Regina Virvilait, Vaida Kvainauskait, et al. IT Market and E-Commerce in Transition Economy [M].//Network ExternalitiesRegional Externalities,Part II. 2007 :149-172.
5Andy Lake. Advances in Spatial Science[M]//Road Pric- ing,the Economy and the Environment. 2008:375-393.
