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Assmann, Richard; von Siegsfeld, Bartsch; Volken, Esther; Brönnimann, Stefan (2012). A new form of the Assman aspiration thermometer, demonstrated at the General Assembly of the German Meteorologial Society in Berlin, 23-25 April 1889. Meteorologische Zeitschrift, 21(4), pp. 421-422. Berlin: Borntraeger 10.1127/0941-2948/2012/530
