xxx
Array
(
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        (
            [id] => 1521
            [topology] => 4<sup>14</sup>T3
            [link_rcsr] => 
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            [transitivity] => [(14)(28)(17)3]
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            [pressure] => 
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            [shear_mod] => 446.6
            [vicker_hard] => 83.5
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

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

)
xxx