@article{10_37236_154,
     author = {Tsz Lung Chan and Wai Shun Cheung and Tuen Wai Ng},
     title = {Graceful tree conjecture for infinite trees},
     journal = {The electronic journal of combinatorics},
     year = {2009},
     volume = {16},
     number = {1},
     doi = {10.37236/154},
     zbl = {1188.05110},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/154/}
}