@article{10_1017_S0017089507003734,
     author = {LUCA, FLORIAN and SHPARLINSKI, IGOR E.},
     title = {ON {THE} {SQUARE-FREE} {PARTS} {OF} \ensuremath{\lfloor}en!\ensuremath{\rfloor}},
     journal = {Glasgow mathematical journal},
     pages = {391--403},
     year = {2007},
     volume = {49},
     number = {2},
     doi = {10.1017/S0017089507003734},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089507003734/}
}