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      <record key="001" att1="001" value="LIB903664604" att2="LIB903664604">001   LIB903664604</record>
      <field key="010" subkey="">LIB903663600</field>
      <field key="037" subkey="x">deutsch</field>
      <field key="050" subkey="x">Aufsatz, Sammelband</field>
      <field key="090" subkey="">010</field>
      <field key="100" subkey="">fischer, thomas</field>
      <field key="331" subkey="">einige grundlagen zur experimentellen identifikation oekonomischer systeme</field>
      <field key="544" subkey="n">7710-A;10</field>
      <field key="596" subkey="a">285 - 320</field>
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