@article{BMMS_2013_36_2_a11,
     author = {Kexiang Xu and Kinkar Ch. Das},
     title = {Extremal {Unicyclic} and {Bicyclic} {Graphs} with {Respect} to {Harary} {Index}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2013},
     volume = {36},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2013_36_2_a11/}
}