Liber primus. Relationes generales inter quantitates, per quas corporum coelestium motus circa solem definiuntur
Theoretische Astronomie Bd. 7, GDML_Books, (1906), p. 13 / Harvested from
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     title = {Liber primus. Relationes generales inter quantitates, per quas corporum coelestium motus circa solem definiuntur},
     booktitle = {Theoretische Astronomie Bd. 7},
     series = {GDML\_Books},
     year = {1906},
     pages = {13},
     url = {http://dml.mathdoc.fr/item/PPN236008730+dmdlog9}
}

 (éd.). Liber primus. Relationes generales inter quantitates, per quas corporum coelestium motus circa solem definiuntur, dans Theoretische Astronomie Bd. 7, GDML_Books,  (1906), p. 13. http://gdmltest.u-ga.fr/item/PPN236008730+dmdlog9/