xxx
Array
(
    [0] => Array
        (
            [id] => 834
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            [link_rcsr] => 
            [in_col] => 3
            [transitivity] => [3797]
            [space_group] => Immm
            [pearson] => oI24
            [cn] => 4
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            [pressure] => 
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            [e_gap] => 
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            [bulk_mod] => 436.9
            [shear_mod] => 492.5
            [vicker_hard] => 92.4
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
            [id] => 835
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            [nn] => 1
            [name] => B-B1AL2R2
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            [e_gap] => 
            [energy] => 
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            [shear_mod] => 504.4
            [vicker_hard] => 82.7
            [ref_file] => /References/2012_PhysRevLet_108_135501
            [publ_year] => 2012
            [ref] => 
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    [2] => Array
        (
            [id] => 836
            [topology] => 4<sup>3</sup>T129
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            [density] => 
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            [energy] => 
            [bulk_mod] => 
            [shear_mod] => 
            [vicker_hard] => 
            [ref_file] => /References/2013_PhysRev_B_88_014102
            [publ_year] => 2013
            [ref] => 
        )

)
xxx