1. Behavior of the firm under regulatory constraint;Averch;The American Economic Review,1962
2. Study of seoul public transportation fare policy in operating the integral fare policy;Kim;The Seoul Development Institute,2006
3. Productivity changes by public Transport reforms in the seoul's urban bus industry (using data envelopment analysis with consideration of accident costs);Oh;Journal of Transportation Research Society of Korea,2008
4. Obeng and Kofi The Economics of Private vs. Public Provision of Bus and Transit Services, Second International Conference on Privatization and Deregulation in Passenger Transportation, Tampere, Finnland 1991 16 22