xxx
Array
(
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        (
            [id] => 1535
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            [transitivity] => [8(18)(13)6]
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            [name] => 
            [pressure] => 
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            [e_gap] => 
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            [bulk_mod] => 400.5
            [shear_mod] => 431.0
            [vicker_hard] => 79.9
            [ref_file] => 
            [publ_year] => 
            [ref] => 
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    [1] => Array
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            [energy] => 
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            [ref_file] => /References/2017_ChemPhysChem_18_873
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            [ref] => 
        )

)
xxx