@article{SLC_1993_30_a4,
     author = {Peter Grabner},
     title = {A {Note} on the {Parity} of the {Sum-of-Digits} {Function}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {1993},
     volume = {30},
     url = {http://geodesic.mathdoc.fr/item/SLC_1993_30_a4/}
}