1. Propper, C., Diamiano, M., Leckie, G., Dixon, J.: Impact of patients’ socioeconomic status on the distance travelled for hospital admission in the english national health service. Journal Health Serv. Res. Policy 12(3), 153–159 (2007)
2. Carlsson-Kanyama, A., Liden, A.: Travel patterns and environmental effects now and in the future: implications of differences in energy consumption among socio-economic groups. Ecological Economics 30(3), 405–417 (1999)
3. Rubio, A., Frias-Martinez, V., Frias-Martinez, E., Oliver, N.: Human mobility in advanced and developing economies: A comparative analysis. In: AAAI Spring Symposia Artificial Intelligence for Development, AI-D, Stanford, USA (2010)
4. Frias-Martinez, V., Virseda, J., Frias-Martinez, E.: Socio-economic levels and human mobility. In: Qual Meets Quant Workshop - QMQ 2010 at the Int. Conf. on Information & Communication Technologies and Development, ICTD (2010)
5. Eagle, N.: Network diversity and economic development. Science 328(5981) (2010)