DERRICK, L.N. Checklist of European Pteridophytes / L.N. Derrick, A.C. Jermy & A.M. Paul. -- Oslo : Botanical Garden and Museum, University of Oslo, 1987 - 94 p. -- (Sommerfeltia, ISSN 0800-6865 ; 6). ISBN 82-74-002-0 Subjects--Topical Terms: EuropaHelechosPteridofitas Universal Decimal Class. No.: 582.35(4)