Extent of genetic variation at a highly polymorphic esterase locus in Drosophila pseudoobscura.
Coyne JA, Felton AA, Lewontin RC. Extent of genetic variation at a highly polymorphic esterase locus in Drosophila pseudoobscura. Proc Natl Acad Sci U S A. 1978 Oct; 75(10):5090-3.