@misc{Balduin_Gottlieb_(1640-1684)_G.,
 author={Balduin, Gottlieb (1640-1684)},
 howpublished={online},
 publisher={typis Augusti Hanckwitz},
 language={lat},
 title={G. Balduini Epistola ad incomparabilem mathematicum [...] Johannem Hevelium [...] de ejusdem machina Coelesti maximè verò de proteo suô hyperbolico novô aliisq[ue] speculis praegrandibus Chalybeis paratis.},
 type={stary druk},
}