Eustachii de Divinis ... Brevis annotatio in systema Saturnium Christiani Eugenii.
Note:
"Although the tracts, Brevis annotatio in systema Saturnium (Rome, 1660) and Pro sua annotatione in systema Saturnium... (Rome, 1661), indicated Divini as their author, it has been generally agreed ever since that time that they came in fact from the pen of Fabri" cfr. Eustachio Divini versus Christiaan Huygens : a reappraisal / Albert van Helden, in Physis, a. 12 (1970)
Huygens, Christiaan 1629-1695. Volumen secundum. p. [597]-618