xxx
Array
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        (
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            [shear_mod] => 368.9
            [vicker_hard] => 67.5
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            [ref] => 
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            [ref_file] => /References/2010-2011_Anno Accademico_Giorgio_BENEDEK
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            [ref] => 
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    [2] => Array
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            [vicker_hard] => 
            [ref_file] => /References/2013_Diamond_RelatedNanostructures_6_75_89
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            [ref] => 
        )

)
xxx