@article{10_4064_aa132_2_2,
     author = {Anwar Ayyad and Todd Cochrane},
     title = {Lattices in $\mathbb Z^2$ and the congruence $xy+uv \equiv c (mod m)$},
     journal = {Acta Arithmetica},
     pages = {127--133},
     publisher = {mathdoc},
     volume = {132},
     number = {2},
     year = {2008},
     doi = {10.4064/aa132-2-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa132-2-2/}
}