xxx
Array
(
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        (
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            [shear_mod] => 445.7
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            [publ_year] => 
            [ref] => 
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        (
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            [ref] => 
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    [2] => Array
        (
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            [ref_file] => /References/2014_EPL_Amm2_repetition
            [publ_year] => 2014
            [ref] => 
        )

)
xxx