Folner, Erling <br/><br/>
A generalization of the general diophantine approximation theorem of Kronecker and the W-almos periodicity and mean value of some sets in a topological abelian group 
Erling Folner 
 - Kobenhavns  Universitet Kobenhavns  1988 
 - pag. dif  20 cm 
 - Preprint series  7 .
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