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*245  $aFrimerker med matematikkmotiver$cGunnar Gjone$n1
*300  $aS. 18, 20-21
*773  $tSymbol$gÅrg. 8, nr 4 (1983)$x0333-0346$w(NO-LaBS)801321(tnr)
*999  $z8400058729$anorart:8400058729
^