Well, "it works" for me in that it doesn't die with no kind of error message :) but doesn't work because the html isn't what you think it is :) so no info is extracted 
#!/usr/bin/perl --
use strict;
use warnings;
use WWW::Mechanize 1.73;
use Web::Scraper 0.37;
use Data::Dump;


my $out = scraper {
    process ".gs_rt", "title[]" => scraper {
        process ".gs_a",  "info"  => 'TEXT';
        process q{gs_a},  "info"  => 'TEXT';
    };
};

my $mech = WWW::Mechanize->new(qw/ autocheck 1 /);
$mech->show_progress(1);

$mech->get(
"http://scholar.google.it/scholar?hl=en&q=Handbuch+der+biologischen+Ar
+beitsmethoden"
);


if( $mech->follow_link( url_regex => qr/cites/i, n => 1 ) ){
    my $result  = $mech->content;
    my $indi    = $mech->uri();
    my $res     = $out->scrape( $result, $indi );
#~     dd( $result, $res );
    dd( $res );
}

__END__
$ perl web-scraper-google-pm1057095.pl
** GET http://scholar.google.it/scholar?hl=en&q=Handbuch+der+biologisc
+hen+Arbeitsmethoden ==> 200 OK (1s)
** GET http://scholar.google.it/scholar?cites=3692889479872081319&as_s
+dt=2005&sciodt=0,5&hl=en&oe=ASCII ==> 200 OK
{ title => [{}, {}, {}, {}, {}, {}, {}, {}, {}, {}] }

[download]

If you want to fixup your 'css paths' use htmltreexpather.pl / xpather.pl , compare the hierarchy 

HTML::Element=HASH(0xcac644)    0.1.0.8.0.1.2.0.0
The fire of life. An introduction to animal energetics.
/html/body/div/div[5]/div/div[2]/div[2]/div/h3
//div[@id='gs_ccl']/div[2]/div/h3
//div[@id='gs_ccl']/div[@style='z-index:400' and @class='gs_r']/div[@c
+lass='gs_ri']/h3[@class='gs_rt']
------------------------------------------------------------------
HTML::Element=HASH(0xcac534)    0.1.0.8.0.1.2.0.1
M Kleiber - The fire of life. An introduction to animal energetics., 1
+961 - cabdirect.org
/html/body/div/div[5]/div/div[2]/div[2]/div/div
//div[@id='gs_ccl']/div[2]/div/div
//div[@id='gs_ccl']/div[@style='z-index:400' and @class='gs_r']/div[@c
+lass='gs_ri']/div[@class='gs_a']
------------------------------------------------------------------

[download]

gs_a is not a child of gs_rt, they're siblings, they're bot children of gs_ri 

//div[@class='gs_r']/div[@class='gs_ri']/h3[@class='gs_rt']
//div[@class='gs_r']/div[@class='gs_ri']/div[@class='gs_a']

[download]

In reply to Re^3: Problem in using Web::Scraper, coming from HTML::TreeBuilder::XPath by Anonymous Monk
in thread Problem in using Web::Scraper, coming from HTML::TreeBuilder::XPath by sbasbasba

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