Schaaf, M <br/><br/>
Reduction of the product of two irrducible unitary representations of the proper orthochronous quantum mechanical poincare' group 
M. Schaaf 
 - Berlin  Springer  1970 
 - iv  120 
 - Lecture notes in physics 5 .
<br/><br/><label>Dewey Class. No.: </label>13.04+22  / SCHA