<record>
  <controlfield tag="001">88579</controlfield>
  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">magnetismo–tesis doctorales</subfield>
  </datafield>
  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">nanotecnología–tesis doctorales</subfield>
  </datafield>
  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">medicina nuclear–tesis doctorales</subfield>
  </datafield>
</record>