xxx
Array
(
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        (
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            [topology] => 4<sup>20</sup>T1
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            [transitivity] => [(20)(30)(27)(17)]
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            [shear_mod] => 439.8
            [vicker_hard] => 82.5
            [ref_file] => 
            [publ_year] => 
            [ref] => 
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    [1] => Array
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            [ref_file] => /References/2013_JChemPhys_138_114101
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            [ref] => 
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)
xxx