xxx
Array
(
    [0] => Array
        (
            [id] => 1255
            [topology] => 4<sup>12</sup>T1
            [link_rcsr] => 
            [in_col] => 12
            [transitivity] => [(12)(18)(16)(10)]
            [space_group] => Pmc21
            [pearson] => oP24
            [cn] => 4
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            [pressure] => 
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            [e_gap] => 
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            [shear_mod] => 441.0
            [vicker_hard] => 82.8
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
            [id] => 1256
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            [cn_sort] => 004-
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            [caid] => 324
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            [energy] => 
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            [ref_file] => /References/2012_PhysRevLet_108_135501
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            [ref] => 
        )

)
xxx