Liu, Y;    Green, A;    Pensiero, N;      (2016)    Expansion of higher education and inequality of opportunities: a cross-national analysis.                   Journal of Higher Education Policy and Management , 38  (3)   pp. 242-263.    10.1080/1360080X.2016.1174407 <https://doi.org/10.1080/1360080X.2016.1174407>.       Green open access