<?xml version="1.0"?>
<dblp>
<article key="journals/jct/Ding09" mdate="2009-02-11">
<author>Cunsheng Ding</author>
<title>Optimal and perfect difference systems of sets.</title>
<pages>109-119</pages>
<year>2009</year>
<volume>116</volume>
<journal>J. Comb. Theory, Ser. A</journal>
<number>1</number>
<ee>http://dx.doi.org/10.1016/j.jcta.2008.05.007</ee>
<url>db/journals/jct/jcta116.html#Ding09</url>
</article>
</dblp>
