1. Segurança e Democracia;Amaral Gurgel,1978
2. Das politische conglomerat Brasilien;Backheuser;Zeitschrift für Geopolitik,1926
3. The state crisis and the region—preliminary thoughts from a third world perspective;Becker,1984
4. Geography in Brazil in the 1980s: background and recent advances;Becker;Progress in Human Geography,1986
5. Le Brésil Méridional;Carvalho,1910