@article{van Ham2001,
author = {van Ham, M. and Mulder, C.H. and Hooimeijer, P.},
title= {Spatial flexibility in job mobility: Macrolevel opportunities and microlevel restrictions},
year = {2001},
doi = {10.1068/a33164},
volume = {33},
number = {5},
pages = {921--940},
}