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Seehausen, Ole; van Alphen, JJM; Lande, R (1999). Color polymorphism and sex ratio distortion in a cichlid fish as an incipient stage in sympatric speciation by sexual selection. Ecology Letters, 2(6), pp. 367-378. Wiley-Blackwell Publishing 10.1046/j.1461-0248.1999.00098.x
