@article {Portela2010,
	title = {Measurement error in education and growth regressions},
	journal = {Scandinavian Journal of Economics},
	volume = {112},
	number = {3},
	year = {2010},
	pages = {618-639}
}
@article {Portela2009,
	title = {Perceptions of the Bologna process: What do students{\textquoteright} choices reveal?},
	journal = {Higher Education},
	volume = {58},
	number = {4},
	year = {2009},
	pages = {465-474}
}
@article {Portela2008,
	title = {Evaluating student allocation in the Portuguese public higher education system},
	journal = {Higher Education},
	volume = {56},
	number = {2},
	year = {2008},
	pages = {185-203}
}
@article {Portela2001,
	title = {Measuring skill: A multi-dimensional index},
	journal = {Economics Letters},
	volume = {72},
	number = {1},
	year = {2001},
	pages = {27-32}
}
