Canonical structural spine
The work's own structure
Reviewed edition: Claudius Ptolemaeus, Apotelesmatica (=Tetrabiblos), Boll and Boer, Teubner 1954, volume 3.1; Greek edition-bound divisions. Division axes: book → chapter → section. Structural nodes alone do not assert commentary citations.
Record-local commentary evidence
Commentary citations: work locus ↔ Dante locus
These citations occur in later commentary. They do not, by themselves, mean Dante cited this work.