@misc{Calvisuis_Sethus_(1556-1615)_Sethi, author={Calvisuis, Sethus (1556-1615)}, howpublished={online}, publisher={Typis & impensis Iohannis Eichorn}, language={lat}, title={Sethi Calvisii Elenchus calendarii gregoriani : in quo errores, qvi passim in anni quantitate & epactis, quæ festa mobilia vitiosissime determinant, comittuntur, manifestè demonstrantur : & dvplex calendarii melioris & expeditioris formula proponitur editus opera Davidis Origani}, type={starodruk}, }