@article{10_37236_1549,
     author = {Andrew Granville and J. L. Selfridge},
     title = {Product of integers in an interval, modulo squares},
     journal = {The electronic journal of combinatorics},
     year = {2001},
     volume = {8},
     number = {1},
     doi = {10.37236/1549},
     zbl = {1107.11042},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1549/}
}