@article{10_37236_8942,
     author = {J{\o}rgen Bang-Jensen and Thomas Bellitto and Thomas Schweser and Michael Stiebitz},
     title = {Haj\'os and {Ore} constructions for digraphs},
     journal = {The electronic journal of combinatorics},
     year = {2020},
     volume = {27},
     number = {1},
     doi = {10.37236/8942},
     zbl = {1435.05088},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/8942/}
}