@article{10_37236_907,
     author = {Le Anh Vinh},
     title = {On the number of orthogonal systems in vector spaces over finite fields},
     journal = {The electronic journal of combinatorics},
     year = {2008},
     volume = {15},
     doi = {10.37236/907},
     zbl = {1160.05323},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/907/}
}