@article{AM2_1990__39_2-3_137353,
     author = {L. Lewin and M. Abouzahra},
     title = {Supernumary polylogarithmic ladders and related functional equations.},
     journal = {Aequationes mathematicae},
     pages = {210--253},
     publisher = {mathdoc},
     volume = {39},
     number = {2-3},
     year = {1990},
     zbl = {0729.33015},
     url = {http://geodesic.mathdoc.fr/item/AM2_1990__39_2-3_137353/}
}