@article{DBLP:journals/ijfcs/IbarraDY08,
author = {Oscar H. Ibarra and
Zhe Dang and
Linmin Yang},
title = {On Counter Machines, Reachability Problems, and Diophantine
Equations},
journal = {Int. J. Found. Comput. Sci.},
volume = {19},
number = {4},
year = {2008},
pages = {919-934},
ee = {http://dx.doi.org/10.1142/S0129054108006042},
bibsource = {DBLP, http://dblp.uni-trier.de}
}