The local postage stamp problem  Part 2  The bases $A_  $ and $A_4$ 
Ernst S. Selmer 
 - Bergen  University of Bergen  1986 
 - pg. dif  tab  29 cm 
 - Department of pure mathematics  44-09-15-86  ISSN 0332-5047 .
<br/><br/> Cuprinde bibliografie pe capitole