By Ramalho Esmeralda   Ramalho Joaquim   in Applied Economics Letters

ISSN:1466-4291|14|3|171-174

Routledge Ltd‎(2007)‎

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By Ramalho Esmeralda   Ramalho Joaquim   Henriques Pedro   in Journal of Productivity Analysis

ISSN:0895-562X|34|3|239-255

Springer Publishing Company ‎(2010)‎

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By Ramalho Esmeralda A.   Smith Richard J.   in The Review of Economic Studies

ISSN:0034-6527|80|1|343-364

Oxford University Press‎(2013)‎

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