@article{DMGT_2012_32_3_a3,
     author = {Ahmad, Ali and Baskoro, E. and Imran, M.},
     title = {Total vertex irregularity strength of disjoint union of {Helm} graphs},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {427--434},
     publisher = {mathdoc},
     volume = {32},
     number = {3},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2012_32_3_a3/}
}