Shivas, M.G. 1961: Contribution to the cytology and taxonomy of species of Polypodium in Europe and America. I. Cytology. Journal of the Linnean Society. Botany 58: 13–25.

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Shivas, M.G. 1961: Contribution to the cytology and taxonomy of species of Polypodium in Europe and America. I. Cytology. Journal of the Linnean Society. Botany 58: 13–25.