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      <record key="001" att1="001" value="LIB902331802" att2="LIB902331802">001   LIB902331802</record>
      <field key="037" subkey="x">englisch</field>
      <field key="050" subkey="x">Buch</field>
      <field key="076" subkey="">Formalwissenschaft</field>
      <field key="100" subkey="">spiegel, murray r.</field>
      <field key="331" subkey="">schaum's outline of theory and problems of calculus of finite differences and difference equations</field>
      <field key="403" subkey="">1. ed.</field>
      <field key="410" subkey="">new york, st. louis, san francisco</field>
      <field key="412" subkey="">mcgraw-hill book company</field>
      <field key="425" subkey="">1971</field>
      <field key="433" subkey="">259 pp.</field>
      <field key="451" subkey="">schaum's outline series</field>
      <field key="517" subkey="c">from the table of contents: the difference calculus; applications of the difference calculus; the sum calculus; applications of</field>
      <field key="the" subkey="">sum calculus; difference equations; applications of difference equations; appendixes; answers to supplementary problems;</field>
      <field key="544" subkey="">5111-B</field>
    </SEQUENTIAL>
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