xxx
Array
(
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        (
            [id] => 687
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            [name] => 
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            [e_gap] => 
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            [shear_mod] => 148.9
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            [ref_file] => 
            [publ_year] => 
            [ref] => 
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    [1] => Array
        (
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            [Year] => 2014
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            [topology_str] => aht-3,4-Cmcm
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            [nn] => 1
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            [shear_mod] => 178.2
            [vicker_hard] => 27.6
            [ref_file] => /References/2014_JSupHardMat_36_257
            [publ_year] => 2014
            [ref] => 
        )

    [2] => Array
        (
            [id] => 689
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            [topology_str] => aht-3,4-Cmcm
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            [caid] => 149
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            [density] => 
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            [energy] => 
            [bulk_mod] => 
            [shear_mod] => 
            [vicker_hard] => 
            [ref_file] => /References/2015_PhysStatSolB_252_1656
            [publ_year] => 2015
            [ref] => 
        )

)
xxx