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2. Materials towards a flora of Turkey: XV. Valerianaceae: Valerianella;Coode;Notes R. Bot. Garden Edinb.,1967
3. Pollen Morphology and Plant Taxonomy. An Introduction to Palynology, 1. Angiosperms;Erdtman,1952
4. An introduction to a Scandinavian pollen flora;Erdtman;Grana Palynol.,1961
5. An Introduction to a Scandinavian Pollen Flora II;Erdtman,1963