Manfred Kudlek and Benedek Nagy.
Distances of formal languages.
Pure Mathematics and Applications - PU.MA, 17(3-4):349-357,
2008.
[link]
[link]
@Article{Kudlek+08b,
author = {Kudlek, Manfred and Nagy, Benedek},
title = {Distances of Formal Languages},
journal = {Pure Mathematics and Applications -- PU.MA},
year = 2008,
volume = 17,
number = {3--4},
pages = {349--357},
url = {http://www.bke.hu/puma/}
}