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    <SEQUENTIAL>
      <record key="001" att1="001" value="LIB910826708" att2="LIB910826708">001   LIB910826708</record>
      <field key="010" subkey="">IHS101236104</field>
      <field key="037" subkey="x">englisch</field>
      <field key="050" subkey="x">Aufsatz, Sammelband</field>
      <field key="090" subkey="">036</field>
      <field key="100" subkey="">samuelson, paul a.</field>
      <field key="331" subkey="">abstract of a theorem concerning substitutability in open leontief models</field>
      <field key="525" subkey="">reprinted from: t.c. koopmans (ed.), activity analysis of production and allocation, wiley, 1951, pp. 142-146</field>
      <field key="544" subkey="n">4482-A/I;36</field>
      <field key="596" subkey="a">515 - 519</field>
    </SEQUENTIAL>
  </section>