Jorgensen, Palle E. T <br/><br/>
Lie algebras of unbounded operators  perturbation theory, and analytic continuation of sl (2, R) - modules1  Palle E. T. Jorgensen, Robert T. Moore 

 - Aarhus  Universitet Aarhus  1980/81 
 - pag. dif  20 cm 
 - Preprint series  22 .
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