Mathematical Reviews 

 - United  states American Mathematical society      1970 
 - 745-1707  cm. 
<br/><br/><label>Standard No.: </label>154734 
<br/><br/><label>Source: </label> Reference Collections 
<br/><br/><label>Dewey Class. No.: </label>"Bm .73 . N70, L0 . 40 (4)"