P.1/3
P.2/3
P.3/3
"Problema duplex Calendarii fundamentale;" Par M. Ch. Zeller, Bulletin de la Société Mathématique de France, vol.11, pp.59-61, (Séance du 16 mars 1883) - in Latin.
Note the Continental use of comma for decimal separator and dot for multiplication.
From scans by Anthony Holley, of photocopies.
The paper shown above is translated and discussed in zel-1883.htm.