@article{10_21136_CMJ_1981_101762,
     author = {Niepel, \v{L}udov{\'\i}t and Tomasta, Pavel},
     title = {Elevation of a graph},
     journal = {Czechoslovak Mathematical Journal},
     pages = {475--483},
     publisher = {mathdoc},
     volume = {31},
     number = {3},
     year = {1981},
     doi = {10.21136/CMJ.1981.101762},
     mrnumber = {626921},
     zbl = {0475.05080},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/articles/10.21136/CMJ.1981.101762/}
}