xxx
Array
(
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        (
            [id] => 1104
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            [pressure] => 
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            [shear_mod] => 486.0
            [vicker_hard] => 91.1
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            [publ_year] => 
            [ref] => 
        )

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        (
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            [vicker_hard] => 91.1
            [ref_file] => /References/2015_PhysChemChemPhys_17_1332
            [publ_year] => 2015
            [ref] => 
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    [2] => Array
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            [vicker_hard] => 
            [ref_file] => /References/2015PhysRevB91_214104
            [publ_year] => 2015
            [ref] => 
        )

)
xxx