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The 9 references without a DOI — listed, not checked
no DOI — not checkedBarton, N H, and Hewitt, G M. 1980. Hybrid zones and speciation. In Essays on Evolution and Speciation in Honour of M J D White, eds. W. R. Atchley, D. S. Woodruff. Cambridge Univ. Press (in press).
no DOI — not checkedBazykin, A D. 1969. A hypothetical mechanism of speciation. Evolution, 23, 685–687.
no DOI — not checkedBazykin, A D. 1972. Disadvantage of heterozygotes in a population within a continuous area. Genetika, 8, 162–167.
no DOI — not checkedBazykin, A D. 1973. Population genetic analyses of disruptive and stabilizing selection. II. Systems of adjacent populations and populations within a continuous area. Genetika, 9, 156–166.
no DOI — not checkedCrow, J F, and Kimura, M. 1970. An Introduction to Population Genetics Theory. Harper and Row.
no DOI — not checkedHadeler, K P. 1976. Travelling population fronts. In Population Genetics and Ecology, eds. S. Karlin, E. Nevo. Academic Press.
no DOI — not checkedKey, K. 1974. Speciation in the Australian Morabine grasshoppers. In Genetic Mechanisms of Speciation in Insects, ed. M. J. D. White. Aust. and New Zealand Book Co.
no DOI — not checkedSoong, T T. 1973. Random Differential Equations. Academic Press.
no DOI — not checkedWhite, M J D. 1978. Modes of Speciation. W. H. Freeman Ltd.
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