@article{10_37236_9844,
     author = {Arnfried Kemnitz and Margit Voigt},
     title = {A note on complex-4-colorability of signed planar graphs},
     journal = {The electronic journal of combinatorics},
     year = {2021},
     volume = {28},
     number = {2},
     doi = {10.37236/9844},
     zbl = {1464.05154},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/9844/}
}