Full reference OpenMind biblio ref
Swerdlow, Noel. 1977. “A Summary of the Derivation of the Parameters in the Commentariolus from the Alfonsine Tables With an Appendix on the Length of the Tropical Year in Abraham Zacuto’s Almanach Perpetuum”. Centaurus 21 (3-4): 201-13.
{ Noel Swerdlow, 1977 #782 }