$a Strona Harvard University Herbaria, 07.09.2011 $u http://kiki.huh.harvard.edu/databases/botanist_search.php?mode=details&id=1069
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$a The ferns (Filicales) : treated comparatively with a view to their natural classification. Vol. 2, The Eusporangiatae and other relatively primitive ferns / F. O. Bower. - New Dehli, 1963. $b Red.