@article{bdj-cpr-09,
author = {Sergey Bereg and Adrian Dumitrescu and Minghui Jiang},
title = {On covering problems of {R}ado},
journal = {Algorithmica},
year = {2009},
note = {to appear},
url = {http://dx.doi.org/10.1007/s00453-009-9298-z}
}