<?xml version="1.0"?>
<dblp>
<article key="journals/appml/ShaoY07" mdate="2006-11-23">
<author>Zhendong Shao</author>
<author>Roger K. Yeh</author>
<title>The <i>L</i>(2, 1)-labeling on planar graphs.</title>
<pages>222-226</pages>
<year>2007</year>
<volume>20</volume>
<journal>Appl. Math. Lett.</journal>
<number>2</number>
<ee>http://dx.doi.org/10.1016/j.aml.2006.02.033</ee>
<url>db/journals/appml/appml20.html#ShaoY07</url>
</article>
</dblp>
