@incollection{401250,
title = {``Vielleicht f\"ur menschliche Kr\"afte unausf\"uhrbar.'' A mathematical proof of a Danish astronomer?},
booktitle = {Mathematics throughout the ages},
series = {GDML\_Books},
publisher = {Prometheus},
address = {Praha},
year = {2001},
pages = {196-201},
language = {en},
url = {http://dml.mathdoc.fr/item/401250}
}
Gropp, Harald. “Vielleicht für menschliche Kräfte unausführbar.” A mathematical proof of a Danish astronomer?, dans Mathematics throughout the ages, GDML_Books, (2001), pp. 196-201. http://gdmltest.u-ga.fr/item/401250/