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    <SEQUENTIAL>
      <record key="001" att1="001" value="LIB902792301" att2="LIB902792301">001   LIB902792301</record>
      <field key="037" subkey="x">englisch</field>
      <field key="050" subkey="x">Buch</field>
      <field key="076" subkey="">Ökonomie</field>
      <field key="087" subkey="a">28</field>
      <field key="100" subkey="">koopmans, tjalling c.</field>
      <field key="100" subkey="b">beckmann, martin (ed.)</field>
      <field key="104" subkey="b">christ, carl f. (ed.)</field>
      <field key="108" subkey="b">nerlove, marc (ed.)</field>
      <field key="331" subkey="">scientific papers of tjalling c. koopmans</field>
      <field key="403" subkey="">1. ed.</field>
      <field key="410" subkey="">berlin, heidelberg, new york</field>
      <field key="412" subkey="">springer-verlag</field>
      <field key="425" subkey="">1970</field>
      <field key="433" subkey="">xii, 600 pp.</field>
      <field key="544" subkey="">5995-B</field>
    </SEQUENTIAL>
  </section>