6Douglas O,Osula A.A Procedure for Estimating Transit Subsidization Requirements for Developing Countries[J].Transportation Research A,1998,32(8):599-606.
7Carlquist E.Incentive contracts in Norwegian local public transport:the Hordaland model[C]//7th In-ternational Conference on Competition and Owner-ship in Land Passenger Transport,Norway:Molde,2001:1-15.
8Elgar I,Kennedy C.Review of optimal transit subsi-dies:comparison between models[J].Journal of Ur-ban Planning and Development,2005(2):71-78.
9Rainald B,Matthias W.Commuting Subsidies With Two Transport Modes[J].Journal of Urban Eco-nomics,2008,63(3):841-848.
10Van R P.Subsidisation of urban public transport and the Mohring effect [J].Journal of Transport Eco-nomics and Policy,2008,42(2):349-359.