Schaaf, Manfred <br/><br/>
The reduction of the product of two irreducible unitary representations of the proper orthochronous quantummechanical Poincare group / 
Manfred Schaaf 
 - Berlin :  Springer-Verlag,  1970 
 - iv, 120 p. ;  26 cm. 
 - Lecture notes in physics ;  5 .
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Poincare series<br/>Representations of groups<br/>Symmetry (Physics)