@article{MOMA_1989__107_3_178426,
     author = {Bodo Volkmann and Anne Bertrand-Mathis},
     title = {On (..., {k)-Normal} {Words} in {Connecting} {Dynamical} {Systems.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {267--280},
     publisher = {mathdoc},
     volume = {107},
     number = {3},
     year = {1989},
     zbl = {0648.10032},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1989__107_3_178426/}
}