@Book{BVMC:622137, author = {Constantino VII, Emperador de Oriente}, title = {Constantini Porphyrogennetae Imp. De thematibus occiduae partis Orientalis imperij lib. II}, url = {https://www.cervantesvirtual.com/obra/constantini-porphyrogennetae-imp-de-thematibus-occiduae-partis-orientalis-imperij-lib-ii} }