Koshmanen, Volodymyr <br/><br/>
Singular quadratic forms in perturbation theory 
Volodymyr Koshmanen 
 - Dordrecht, Boston  Kluwer Academic Publishers  1999 
 - VIII, 308 p  24 cm 
 - Mathematics and its application  474 .
<br/><br/> Contine bibliogr 
<br/><br/><label>ISBN: </label>079235625x