Performance in urban public transport systems: A critical analysis of the Portuguese case L. Cruz E. Barata J.-P. Ferreira Publication Journal: International Journal of Productivity and Performance Management Year of Publication: 2012 Volume: 61 Issue: 7 Pagination: 730-751 Identifiers Other Numbers: 2-s2.0-84866644855 Alternative titles DOIGoogle ScholarBibTeXRIS Locators