@article{DMGT_2005_25_3_a13,
     author = {Chartrand, Gary and Erwin, David and VanderJagt, Donald and Zhang, Ping},
     title = {On \ensuremath{\gamma}-labelings of trees},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {363--383},
     publisher = {mathdoc},
     volume = {25},
     number = {3},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2005_25_3_a13/}
}