@article{BMMS_2011_34_2_a18,
     author = {Gul Zaman},
     title = {Qualitative {Behavior} of {Giving} {Up} {Smoking} {Models}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2011},
     volume = {34},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2011_34_2_a18/}
}