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http://journals.cambridge.org/action/displayAbstract?aid=1731144
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KATHRYN A. HODGINS
and SPENCER C. H. BARRETT
(2008).
Asymmetrical mating patterns and the evolution of biased style-morph ratios in a tristylous daffodil. Genetics Research, 90
,
pp 3-15
doi:10.1017/S0016672307008956