@article{10_37236_814,
     author = {L. J. Cowen and Robert Cowen and Arthur Steinberg},
     title = {Totally greedy coin sets and greedy obstructions},
     journal = {The electronic journal of combinatorics},
     year = {2008},
     volume = {15},
     doi = {10.37236/814},
     zbl = {1165.05314},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/814/}
}