Master, S; Diallo, DP; Kande, S; Wade S.2000. The Velingara Ring Structure in Haute Casamance, Senegal: A possible large buried meteorite impact crater. Lunar and Planetary Science, 30, 1926. (online), avairable from <http://www.image-contrails.de/senegal/VELINGARA_1926.pdf>.
Wade, S; Lichtenegger, J; Barbieri, M; Rudant, J‐P; Deffontaines, B; Fruneau, B; Master, S.2002. Application of satellite radar interferometry in enhancing the morphology of the Velingara Structure, Casamance, Senegal. Lunar and Planetary Science, 32, 1556. (online), available from <http://www.lpi.usra.edu/meetings/lpsc2002/pdf/1556.pdf>.