Seiya Negami. Projective-planar graphs with even duals. Journal of Graph Theory, 16(4):287-295, 1992. [doi]
@article{Negami92, title = {Projective-planar graphs with even duals}, author = {Seiya Negami}, year = {1992}, doi = {10.1002/jgt.3190160402}, url = {http://dx.doi.org/10.1002/jgt.3190160402}, researchr = {https://researchr.org/publication/Negami92}, cites = {0}, citedby = {0}, journal = {Journal of Graph Theory}, volume = {16}, number = {4}, pages = {287-295}, }