xxx
Array
(
    [0] => Array
        (
            [id] => 883
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            [link_rcsr] => http://rcsr.net/nets/cla
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            [e_gap] => 
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            [shear_mod] => 395.9
            [vicker_hard] => 73.2
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
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            [ref_file] => /References/2013_JChemPhys138_164703_KelvinC
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            [ref] => 
        )

)
xxx