Folner, Erling <br/><br/>
Congruence invariants for the pair measurable sets A, CA on the surface of a sphere 
Erling Folner 
 - Kobenhavns  Universitet Kobenhavns  1981 
 - 11 p  fig  20 cm 
 - Preprint series  4 .
<br/><br/> Contine bibliografie  Lucrarea este multigrafiata