@TechReport{freytag_et_al:DagSemRep.15,
  author =	{Freytag, Johann Christoph and Maier, David and Vossen, Gottfried},
  title =	{{Query Processing in Object-Oriented, Complex Object, and Nested Relation Databases (Dagstuhl Seminar 9125)}},
  pages =	{1--32},
  ISSN =	{1619-0203},
  year =	{1991},
  type = 	{Dagstuhl Seminar Report},
  number =	{15},
  institution =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemRep.15},
  URN =		{urn:nbn:de:0030-drops-149038},
  doi =		{10.4230/DagSemRep.15},
}