@article{10_37236_1118,
     author = {Nicholas Cavenagh and Diana Combe and Adrian M. Nelson},
     title = {Edge-magic group labellings of countable graphs},
     journal = {The electronic journal of combinatorics},
     year = {2006},
     volume = {13},
     doi = {10.37236/1118},
     zbl = {1111.05085},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1118/}
}