calendrier
1985 / Mathematics of the Gregorian Calendar / V. Frederick Rickey / The Mathematical Intelligencer 7 (1985) p. 53 [doi]
1988 / On the Gregorian revision of the Julian calendar / Jacques Dutka / The Mathematical Intelligencer 10 (1988) p. 56 [doi]
2005 / History of one defeat: reform of the Julian calendar as envisaged by Isaac Newton / Ari Belenkiy ; Eduardo Vila Echagüe / Notes and Records 59 (2005) p. 223 [doi]