@article{AM2_1986__30_137109,
     author = {L. Lewin},
     title = {The order-independence of the polylogarithmic ladder structure - implications for a new category of functional equations.},
     journal = {Aequationes mathematicae},
     pages = {1--20},
     publisher = {mathdoc},
     volume = {30},
     year = {1986},
     zbl = {0606.39005},
     url = {http://geodesic.mathdoc.fr/item/AM2_1986__30_137109/}
}