1. CELPA (2002): Statistical Bulletin 2001. Portuguese Paper Industry Association, Lisbon (in Portuguese)
2. Dias A, Lopes E, Arroja L, Capela I, Pereira F (2002): Life Cycle Assessment of Paper Production from Eucalyptus globulus. Case Study of the Portuguese Industry. Appita J 55, 21–26
3. Emporsil, Soporcel (1995): Technical Manual: Establishment and Management of Eucalypt Forest Stands. Emporsil/Soporcel (in Portuguese)
4. Eurosac, Eurokraft (1996): LCA of Distribution in Paper Sacks. Eurosac/Eurokraft
5. FEFCO, Groupement Ondulé, Kraft Institute (1997): European Database for Corrugated Board Life Cycle Studies