xxx
Array
(
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        (
            [id] => 1515
            [topology] => 4<sup>6</sup>T38
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            [pressure] => 
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            [shear_mod] => 336.2
            [vicker_hard] => 57.6
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
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            [ref_file] => /References/2017_ChemPhysChem_18_873
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            [ref] => 
        )

)
xxx