@article{BMMS_1999_22_2_a2,
     author = {Mohd. Salmi Md. Noorani},
     title = {Mertens {Theorem} and {Closed
}                        {Orbits} {Of} {Ergodic} {Toral} {Automorphisms}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {1999},
     volume = {22},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/BMMS_1999_22_2_a2/}
}