Mathematical  Reviews 

 - United  states American mathematical society      1973 
 - 896  cm. 
<br/><br/><label>Standard No.: </label>154725 
<br/><br/><label>Source: </label> Reference Collections 
<br/><br/><label>Dewey Class. No.: </label>"Bm .73 .N73, L3 .45(1-3)"