@Misc{V.Valev1992,
author="V. Valev
and Petia Radeva",
title="Determining structural descriptions by boolean formulas advances in structural and syntactic Pattern Recognition.",
year="1992",
optnote="MILAB",
optnote="exported from refbase (http://refbase.cvc.uab.es/show.php?record=251), last updated on Tue, 28 Jun 2011 12:32:09 +0200"
}