Bratteli, Ola <br/><br/>
Unbounded derivations tangential to compact groups of automorphisms 
Ola Bratteli, Palle E. T. Jorgensen 
 - Aarhus  Universitet Aarhus  1980/81 
 - 35 p  fig  20 cm 
 - Preprint series  38 .
<br/><br/> Lucrarea este multigrafiata  Contine bibliografie