xxx
Array
(
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        (
            [id] => 1148
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            [shear_mod] => 471.7
            [vicker_hard] => 88.0
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
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            [ref_file] => /References/2015_PhysChemChemPhys_17_1332
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            [ref] => 
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)
xxx