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Kerner, A. Viola ambigua W. K. in Niederösterreich undViola Thomasiana Perr. et Song. in Tirol. Osterr. botan. Zeitschrift 20, 161–163 (1870). https://doi.org/10.1007/BF01615273
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DOI: https://doi.org/10.1007/BF01615273