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*1001 $aJensen, Eberhart$0(NO-TrBIB)90077434$_51276700
*24510$aOn the dependence of the magnetic field strength of sunspots on their areas in relation to the solar cycle$cEberhart Jensen and Truls S. Ringnes
*260  $aOslo$bAschehoug$c1957
*300  $a16 s.$bill.
*4901 $aAstrophysica Norvegica$vvol. 6, no. 1
*533  $aElektronisk reproduksjon$b[Norge]$cNasjonalbiblioteket Digital$d2011-01-06
*7001 $aRingnes, Truls S.$0(NO-TrBIB)90086771$_11685800
*830 0$aAstrophysica Norvegica (trykt utg.)$x0067-0030$vvol. 6, no. 1$w998440846464702201$_16720600
*85641$3Fulltekst$uhttps://urn.nb.no/URN:NBN:no-nb_digibok_2010111505045$yNettbiblioteket$zDigital representasjon
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