Taxation of Pensions in Portugal: A Semi-Dual Income Tax System
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O sistema fiscal português face à integração europeia
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Internationales Steuer-Lexikon : in 12 Bänden ; zusammenfassende Darstellung der Steuersysteme von 19 Staaten der OECD
Briner, Ernst K., (1977)
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Tax Treatment of research and development : A comparative survey of national fiscal measures and their impact on research
Hoorn, J. van, (1962)
Taxes and investment in Asia and the Pacific
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