1. WIPO, International Patent Classification, 6th Edition
2. The role of patent information in relation to transfer of technology;Coaracy;World Patent Information,1982
3. The Brazilian improvements in the field of patent information;Holanda Cavalcanti;World Patent Info,1994
4. Barroso WBG, Quoniam L, Mise à disposition de demandes de brevet générique VSST’2001 (Veille Stratégique Scientifique et Technologique), October 15–19th 2001, Barcelona
5. Brazil, Code of Industrial Property no. 5.772. December 21, 1971. Law establishing an Industrial Property Code and containing other provisions, Brası́lia