Peptenatu, D., Pintilii, R., Draghici, C. and Peptenatu, A. (2012) “The efficiency of polycentric development strategies in the context of economic crisis. Case study - the development of Southwest Oltenia region - Romania”, Bulletin of Geography. Socio-economic Series, (17), pp. 117–125. doi: 10.1515/v10089-012-0012-6.