The mechanical paradox / by James F.R.S Ferguson

Il ruolo delle tavole alfonsine e proteiche nella riforma gregoriana dei Calendario

por Casanovas, Juan S. J

Time counts : the story of the calendar /

por Watkins, Harold

The planetarium of Giovanni di Dondi, citizen of Padua : manuscript of 1397 /

por Dondi, Giovanni de

Gregorian Reform of the Calendar : proceedings of the Vatican Conference to Commemorate its 400th Anniversary, 1582-1982 /

por Conference to Commemorate the 400th Anniversary of the Gregorian Calendar Reform

Science et astrologie au XVIe siècle : Oronce Fine et son horloge planétaire, 22 novembre-22 décembre, Paris, 1971 /