@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} }