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Fothergill, P.G. Studies in viola, 1: The cytology of a naturally-occurring population of hybrids betweenViola tricolor L. andViola lutea huds. Genetica 20, 159–186 (1938). https://doi.org/10.1007/BF01654278
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DOI: https://doi.org/10.1007/BF01654278