Mathematical reviews 

 - United  States American Mathematical Society      1969 
 - 565-1243  cm. 
<br/><br/><label>Standard No.: </label>154728 
<br/><br/><label>Source: </label> Reference Collections 
<br/><br/><label>Dewey Class. No.: </label>"Bm.73.N69, K9.38(4-6)"