@article{10_37236_5183,
     author = {Roland Bacher},
     title = {Counting invertible {Schr\"odinger} operators over finite fields for trees, cycles and complete graphs},
     journal = {The electronic journal of combinatorics},
     year = {2015},
     volume = {22},
     number = {4},
     doi = {10.37236/5183},
     zbl = {1329.05155},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/5183/}
}