R. Guetto, R. Luijkx, and S. Scherer. Acta Sociologica, 58 (2):
155-172(2015)First published online: March 5, 2015, http://dx.doi.org/10.1177/0001699315573335. (EVS).
L. Cicatiello, S. Ercolano, and G. Gaeta. Empirica, 42 (2):
447-479(2015)First published online: March 12, 2015, http://dx.doi.org/10.1007/s10663-015-9292-4. (EVS).