"Patterns of speciation in Drosophila" (1989) Evolution: 43 pp 362-281
Coyne, J.A. & Orr, H. A
Reproduced by permission of The Society for the Study of Evolution.
One of several famous papers by these authors that have done much to revive interest in the mechanism of speciation. It contains important evidence suggestive of reinforcement in fruitfly speciation, and other tantalising inferences, for instance about how long speciation takes.