xxx
Array
(
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        (
            [id] => 1379
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            [link_rcsr] => 
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            [shear_mod] => 381.2
            [vicker_hard] => 69.0
            [ref_file] => 
            [publ_year] => 
            [ref] => 
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    [1] => Array
        (
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            [ref] => 
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)
xxx