Iohvidov, I. S. and Others <br/><br/>
Introduction to the spectral theory of operators in spaces with an indefinite metric   
By I. S. Iohvidov, M. G. Krein and H. Langer 
 - Berlin  Akademie-Verlag  1982 
 - 120p. Bibl. 
 - Mathematical research   v. 9 .
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<br/><br/><label>Dewey Class. No.: </label>515.72  / Io64.IS