@article{DAS_2018_a13,
     author = {Petr Gregor and Torsten M\"utze and Jerri Nummenpalo},
     title = {A short proof of the middle levels theorem},
     journal = {Discrete analysis},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DAS_2018_a13/}
}