xxx
Array
(
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        (
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            [shear_mod] => 207.1
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            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
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            [cn_sort] => 003-004-001-001-
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            [vicker_hard] => 
            [ref_file] => /References/2016_JMatSci_52_2385
            [publ_year] => 2016
            [ref] => 
        )

)
xxx