Portela, Maria Conceição A. Silva2016-12-152016-12-152014PORTELA, Maria – Efficiency and Value Added in Secondary Education: The case of Portugal. In Efficiency in Education Conference, London, United Kingdom, 19-20 September, 2014. – In JOHNES, Geraint… [et al.], (org.) - Efficiency in Education Workshop Programme & Book of Abstracts. London: The Work Foundation, 2014, [s.ISBN]. p.17http://hdl.handle.net/10400.14/21059engconference object