@article{MZ_1980__171_172929,
     author = {Ulrich Abel},
     title = {On the {Group} of {Piecewise} {Linear} {Monotone} {Bijections} of an {Arc.}},
     journal = {Mathematische Zeitschrift},
     pages = {155--162},
     publisher = {mathdoc},
     volume = {171},
     year = {1980},
     zbl = {0418.57011},
     url = {http://geodesic.mathdoc.fr/item/MZ_1980__171_172929/}
}