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100   $a20000920d1989----km-y0itay50------ba
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200 1 $aCosmology in (2+1) dimensions, ciclic models, and deformations of m 2,1$fdi Guillemin , Victor
210   $aPrinceton [N.J.]$cPrinceton University Press$d1989
215   $aV.228 p.24 cm
225 1 $aAnnals of mathematics studies$v121
700  1$aGuillemin,$bVictor$f<1937- >$040563
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