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2. Electron-microscope investigations into exine stratification;Afzelius;Grana Palynologica,1956
3. Towards terminological unification in pollen and spore morphology;Grana Palynologica,1958
4. Leitfaden der Pollenbestimmung, 1;Beug,1968
5. Les nomenclatures en palynologie;Bronckers;Bull. Soc. Royale Botan. Belg.,1968