Journal of Physics A: Mathematical and Theoretical 
Institute of Physics 
 - Philadelphia  Institute of Physics Publishing  2008 
 - VOL. 41, ISSUE 4, 1 February, 2008 
<br/><br/><label>ISSN: </label>03054470 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physics -- Periodicals
<br/><br/><label>Dewey Class. No.: </label>530 IOP