Wallis, Peter J. L. <br/><br/>
Portable programming 
Peter J. L. Wallis 
 - London  MacMillan  1982 
 - 141 p. : ill. ; 23 cm. 
<br/><br/>p. 126-135 
<br/><br/><label>ISBN: </label>0333310365 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Software compatibility