A fact from Friedrich Oskar Giesel appeared on Wikipedia's Main Page in the Did you know column on 28 September 2009 (check views). The text of the entry was as follows:
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Adloff, J. P. (2000). "The centenary of a controversial discovery: actinium". Radiochimica Acta. 88 (3–4_2000): 123. doi:10.1524/ract.2000.88.3-4.123.
Sakanoue, M. (2003). "On my historical tours relating to radiochemistry, especially to M. Curie and F. Giesel". Czechoslovak Journal of Physics. 53: A343. doi:10.1007/s10582-003-0044-5.
Elsen, G. (1929). "Das Aktiniumproblem". Zeitschrift für anorganische und allgemeine Chemie. 180: 304. doi:10.1002/zaac.19291800132.
Rentetzi, Maria (2008). "The U.S. Radium Industry: Industrial In-house Research and the Commercialization of Science". Minerva. 46 (4): 437. doi:10.1007/s11024-008-9111-1.
Zur Kenntnis und radiometrischen Charakterisierung von Spinthariskopen – Kongenialität und Kollegialität von Friedrich Giesel, Julius Elster & Hans Geitel und Sir William Crookes