@misc{Calvisius_Sethus_(1556-1615)_Sethi,
 author={Calvisius, Sethus (1556-1615)},
 address={Francofurti Marchionum},
 howpublished={online},
 publisher={Eichorn, Johann (1585?-1642). Druk.},
 publisher={Origanus, David (1558-1628). Wyd.},
 language={lat},
 title={Sethi Calvisii Elenchus Calendarii Gregoriani : In quo Errores, Qvi Passim in anni quantitate & Epactis, quæ festa mobilia vitiosissime determinant, comittuntur, manifeste demonstrantur; & Duplex Calendarii Melioris & expeditioris formula proponitur / Editus Opera Davidis Origani Mathematici Professoris in Academia Francofurtana cis Viadrum.},
 keywords={17 w., Kolekcje Piastowskie, kalendarz gregoriański},
}