@article{MOMA_1981__91_178022,
     author = {Hans Haller},
     title = {Rectangle {Exchange} {Transformations.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {215--232},
     year = {1981},
     volume = {91},
     zbl = {0448.47004},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1981__91_178022/}
}