<?xml version="1.0"?>
<dblp>
<article key="journals/ipl/Jedrzejowicz88" mdate="2003-11-20">
<author>Joanna Jedrzejowicz</author>
<title>Infinite Hierarchy of Expressions Containing Shuffle Closure Operator.</title>
<pages>33-37</pages>
<year>1988</year>
<volume>28</volume>
<journal>Inf. Process. Lett.</journal>
<number>1</number>
<url>db/journals/ipl/ipl28.html#Jedrzejowicz88</url>
</article>
</dblp>
