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    <SEQUENTIAL>
      <record key="001" att1="001" value="LIB903823809" att2="LIB903823809">001   LIB903823809</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="">wickelgren, wayne a.</field>
      <field key="331" subkey="">how to solve problems</field>
      <field key="335" subkey="">elements of a theory of problems and problem solving</field>
      <field key="403" subkey="">1. ed.</field>
      <field key="410" subkey="">san francisco</field>
      <field key="412" subkey="">w.h. freeman and company</field>
      <field key="425" subkey="">1974</field>
      <field key="433" subkey="">xi, 262 pp.</field>
      <field key="451" subkey="">a series of books in psychology</field>
      <field key="451" subkey="h">atkinson, richard c. (ed.) ; freedman, jonathan (ed.) ; lindzey, gardner (ed.) ; et al.</field>
      <field key="517" subkey="c">from the table of contents: preface; introduction; problem theory; inference; classification of action sequences; state</field>
      <field key="eva" subkey="l">uation and hill climbing; subgoals; contradiction; working backward; relations between problems; topics in mathematical</field>
      <field key="rep" subkey="r">esentation; problems from mathematics, science, and engineering;</field>
      <field key="540" subkey="">0-7167-0845-0</field>
      <field key="544" subkey="">7950-A</field>
    </SEQUENTIAL>
  </section>