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    s/<volume>(.*)<\/volume>//;$vol=$1;
    s/<issue>(.*)<\/issue>//;$iss=$1;
    s/<year>(.*)<\/year>//;$yr=$1;

    $vol = $1 if /<volume>(.*)<\/volume>/;
    $iss = $1 if /<issue>(.*)<\/issue>/;
    $yr  = $1 if /<year>(.*)<\/year>/;