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    <SEQUENTIAL>
      <record key="001" att1="001" value="LIB906004603" att2="LIB906004603">001   LIB906004603</record>
      <field key="037" subkey="x">englisch</field>
      <field key="050" subkey="x">Buch</field>
      <field key="076" subkey="">Ökonomie</field>
      <field key="100" subkey="">heathfield, david f.</field>
      <field key="104" subkey="a">wibe, soeren</field>
      <field key="331" subkey="">an introduction to cost and production functions</field>
      <field key="403" subkey="">1. ed.</field>
      <field key="410" subkey="">houndmills, london</field>
      <field key="412" subkey="">macmillan education</field>
      <field key="425" subkey="">1987</field>
      <field key="433" subkey="">xv, 193 pp.</field>
      <field key="544" subkey="">11361-A</field>
    </SEQUENTIAL>
  </section>