An Empirical Analysis of the Effects of Options and Futures Listing on the Underlying Stock Return Volatility: The Portuguese Case
João Paulo Tomé Calado, Maria Teresa Medeiros Garcia, Sérgio Emanuel Tomé Mendes Pereira
Applied Financial Economics, vol. 15, 2005, p. 907-913.

The financial sustainability of the portuguese social security system
Carlos Manuel Pereira da Silva, João Paulo Tomé Calado, Maria Teresa Medeiros Garcia
Geneva Papers On Risk And Insurance: Issues And Practice, vol. 29, 2004, p. 417-439.