xxx
Array
(
    [0] => Array
        (
            [id] => 541
            [topology] => isq
            [link_rcsr] => http://rcsr.net/nets/isq
            [in_col] => 2
            [transitivity] => [2331]
            [space_group] => P42/mnm
            [pearson] => tP12
            [cn] => 4
            [Year] => 2014
            [cn_sort] => 004-
            [topology_str] => isq
            [sp_atoms] => 
            [caid] => 102
            [nn] => 0
            [name] => 
            [pressure] => 
            [density] => 3.099
            [e_gap] => 
            [energy] => 0.245
            [bulk_mod] => 372.5
            [shear_mod] => 374.5
            [vicker_hard] => 67.4
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
            [id] => 542
            [topology] => isq
            [link_rcsr] => http://rcsr.net/nets/isq
            [in_col] => 2
            [transitivity] => [2331]
            [space_group] => P42/mnm
            [pearson] => tP12
            [cn] => 4
            [Year] => 2014
            [cn_sort] => 004-
            [topology_str] => isq
            [sp_atoms] => 
            [caid] => 102
            [nn] => 1
            [name] => P42/mnm
            [pressure] => 
            [density] => 
            [e_gap] => 4.55
            [energy] => 
            [bulk_mod] => 362.6
            [shear_mod] => 
            [vicker_hard] => 
            [ref_file] => /References/2014_PhysRevB_89_84112
            [publ_year] => 2014
            [ref] => 
        )

)
xxx