<?xml version="1.0"?>
<dblp>
<article key="journals/jcss/Back81" mdate="2003-11-20">
<author>Ralph-Johan Back</author>
<title>On Correct Refinement of Programs.</title>
<pages>49-68</pages>
<year>1981</year>
<volume>23</volume>
<journal>J. Comput. Syst. Sci.</journal>
<number>1</number>
<url>db/journals/jcss/jcss23.html#Back81</url>
</article>
</dblp>
