by Carl-Johan Widén
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Dryopteris dilatata s. lat. in Europe an...
Chemotaxonomic investigations on Finnish...
Cytogeographic studies on Dryopteris of ...
Spiciligium filicum philippinensium nova...
The Dryopteris spinulosa complex in Finl...
Beiträge zur Wertbestimmung und Stabili...
A monograph of the genus Dryopteris
An introduction to the fern genera of th...