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Erismann, Karl Hans; Brunold, Christian (1967). Die Probeentnahme in kinetischen Stoffwechseluntersuchungen mit Wasserlinsen Lemna minor L. (Lemnaceen). Experientia, 23(3), pp. 235-236. Birkhäuser Verlag 10.1007/BF02136311
Matter, Albert (1967). Tidal flat deposits in the Ordovician of Western Maryland. Journal of Sedimentary Petrology, 2, pp. 601-609. SEPM Society for Sedimentary Geology