@article{DMTCS_2009_11_1_a6,
     author = {Mansour, Toufik},
     title = {Enumeration of words by the sum of differences between adjacent letters},
     journal = {Discrete mathematics & theoretical computer science},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {2009},
     doi = {10.46298/dmtcs.467},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.46298/dmtcs.467/}
}