Journal of Transport Geography
Journal of Transport Geography > 2011 > 19 > 4 > 936-942
Journal of Transport Geography > 2011 > 19 > 6 > 1490-1499
Journal of Transport Geography > 2011 > 19 > 6 > 1530-1533
Journal of Transport Geography > 2011 > 19 > 6 > 1294-1308