Masters' dissertations and doctoral theses abstracts since 1987 were searched in the online database http:// capesdw.capes.gov.br/capesdw/Teses.do maintained by the Coordination for the Improvement of Higher Education Personnel (CAPES), the institution which coordinates and supervises all the Brazilian Graduate Programmes in all areas of knowledge. The full original electronic documents were downloaded from the website when available or obtained through contact with the respective graduate students. Ten dissertations and three theses are presented in Table 3 .