xxx
Array
(
    [0] => Array
        (
            [id] => 557
            [topology] => clh
            [link_rcsr] => http://rcsr.net/nets/clh
            [in_col] => 2
            [transitivity] => [2332]
            [space_group] => P42/mmc
            [pearson] => tP8
            [cn] => 3
            [Year] => 2015
            [cn_sort] => 003-
            [topology_str] => clh
            [caid] => 108
            [nn] => 0
            [name] => 
            [pressure] => 
            [density] => 2.900
            [e_gap] => 
            [energy] => 0.982
            [bulk_mod] => 345.7
            [shear_mod] => 127.8
            [vicker_hard] => 18.8
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
            [id] => 558
            [topology] => clh
            [link_rcsr] => http://rcsr.net/nets/clh
            [in_col] => 2
            [transitivity] => [2332]
            [space_group] => P42/mmc
            [pearson] => tP8
            [cn] => 3
            [Year] => 2015
            [cn_sort] => 003-
            [topology_str] => clh
            [caid] => 108
            [nn] => 1
            [name] => GT-8
            [pressure] => 
            [density] => 2.956
            [e_gap] => 
            [energy] => 
            [bulk_mod] => 348.5
            [shear_mod] => 130.4
            [vicker_hard] => 
            [ref_file] => /References/2015_PhysChemChemPhys_17_13028
            [publ_year] => 2015
            [ref] => 
        )

    [2] => Array
        (
            [id] => 559
            [topology] => clh
            [link_rcsr] => http://rcsr.net/nets/clh
            [in_col] => 2
            [transitivity] => [2332]
            [space_group] => P42/mmc
            [pearson] => tP8
            [cn] => 3
            [Year] => 2015
            [cn_sort] => 003-
            [topology_str] => clh
            [caid] => 108
            [nn] => 2
            [name] => H-1
            [pressure] => 
            [density] => 
            [e_gap] => 
            [energy] => 
            [bulk_mod] => 
            [shear_mod] => 
            [vicker_hard] => 
            [ref_file] => /References/2015_PhysRevLett_115_026403
            [publ_year] => 2015
            [ref] => 
        )

)
xxx