Mathematical methods in solid state and superfluid theory   
ed. by R.C. Clark, G.H. Derrick 
 - Edinburgh  Oliver and Boyd  1969 
 - xvi, 400p. 
<br/><br/><label>ISBN: </label>050016776 
<br/><br/><label>Dewey Class. No.: </label>530.41  / N6810