@Misc{BVMC:687644,
author = {Ptolomeo, Claudio},
author = {Jordanus Nemorarius},
title = {Ptolemaei Planisphaerium. Iordani Planisphaerium},
url = {https://www.cervantesvirtual.com/obra/ptolemaei-planisphaerium-iordani-planisphaerium-0}
}