@article{10_37236_1973,
     author = {T. Alderson},
     title = {Extending arcs: an elementary proof},
     journal = {The electronic journal of combinatorics},
     year = {2005},
     volume = {12},
     doi = {10.37236/1973},
     zbl = {1082.51004},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1973/}
}