xxx
Array
(
    [0] => Array
        (
            [id] => 1270
            [topology] => 4<sup>13</sup>T4
            [link_rcsr] => 
            [in_col] => 13
            [transitivity] => [(13)(17)(17)(13)]
            [space_group] => Imma
            [pearson] => oI72
            [cn] => 4
            [Year] => 2016
            [cn_sort] => 004-
            [topology_str] => 4<sup>13</sup>T4
            [caid] => 331
            [nn] => 0
            [name] => 
            [pressure] => 
            [density] => 3.504
            [e_gap] => 
            [energy] => 0.608
            [bulk_mod] => 422.0
            [shear_mod] => 494.2
            [vicker_hard] => 93.4
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
            [id] => 1271
            [topology] => 4<sup>13</sup>T4
            [link_rcsr] => 
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            [transitivity] => [(13)(17)(17)(13)]
            [space_group] => Imma
            [pearson] => oI72
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            [Year] => 2016
            [cn_sort] => 004-
            [topology_str] => 4<sup>13</sup>T4
            [caid] => 331
            [nn] => 1
            [name] => 8(II)
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            [density] => 
            [e_gap] => 
            [energy] => 
            [bulk_mod] => 
            [shear_mod] => 
            [vicker_hard] => 
            [ref_file] => /References/2016_PhysRevB_93_085201
            [publ_year] => 2016
            [ref] => 
        )

)
xxx