*0011028223
*00520190130100328.0
*007ta
*008140926s2004    xx#           000 u nob d
*00900600caa a2200181 c 4500
*019  $bk
*035  $a(EXLNZ-47BIBSYS_NETWORK)990414456194702201
*035  $a(NO-TrBIB)041445619
*035  $a041445619-47bibsys_network
*040  $aNO-TrBIB$bnob$ekatreg
*1001 $aKirfel, Christoph$d1957-$0(NO-TrBIB)90215303$_18909000
*24510$aPerfekte tall :$bElementære betraktninger$cChristoph Kirfel
*260  $c2004
*300  $as.163-166
*7730 $tNormat$dGöteborg : Nationellt centrum för matematikutbildning$g51(2003)nr 4$x0801-3500$w999303795004702201$w(NO-LaBS)247358(tnr)
*901  $a80
*999  $aoai:nb.bibsys.no:990414456194702202$b2021-11-01T03:15:55Z$z990414456194702202
^