Janssen, Arnold <br/><br/>
Permissible translations of semi group folds; doctoral dissertation of Dortmund Univ.   

 - Dortmund  Dortmund University  1979 
 - ix, 122p. 
<br/><br/> Original German title is" Zulassige translationen von faltungshalbgruppen"   
<br/><br/><label>Dewey Class. No.: </label>512  / J35.PT