Referenced in:

• ed: 186 - Cambridge, Trinity College, R. 15. 32 (945) [base MS (= B) for Abbo, De differentia circuli et sphaerae and De duplici signorum ortu]
• ed: 398 - London, British Library, Cotton Vitellius A. xii, fols. 4-77 120-33 [Abbo, De differentia circuli et sphaerae, coll. as G]
• ed: 428.4 - London, British Library, Harley 2506 120-33 [Abbo, De differentia circuli et sphaerae, coll. as J]
• ed: 483 - London, British Library, Royal 13. A. xi 113-33 [Abbo, De differentia circuli et sphaerae, coll. as L]