@article{De Haas2018,
author = {De Haas, H. and Natter, K. and Vezzoli, S.},
title= {Growing restrictiveness or changing selection? The nature and evolution of migration policies},
year = {2018},
doi = {10.1111/imre.12288},
volume = {52},
number = {2},
pages = {324--367},
}