@misc{Calvisius_Sethus_(1556-1615)_Formvla,
 author={Calvisius, Sethus (1556-1615)},
 address={[Heidelberg]},
 howpublished={online},
 publisher={Vögelin, Gotthard (1572-1634). Druk.},
 language={lat},
 title={Formvla Calendarii Novi : Qvæ Qvidem Alia Est a Calendario Gregoriano, sed tamen expeditior, melior & certior, & quæ a Calendario Gregoriano non discrepat, nisi quando id in diversum abit, & Paschata cum mobilibus Festis aliis, alieno tempore & in Canonibus Ecclesiasticis prohibito agit / Proposita A Setho Calvisio Mathematum & Astronomiæ studioso},
 keywords={17 w., Kolekcje Piastowskie, kalendarz gregoriański, Bibliotheca Rudolphina},
}