The Cosmic Jigsaw: DTFE analysis of the Cosmic Web
      CITA, Toronto;
      May 11, 206

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   Void Simulations
      "Cosmic Voids", Aspen
      June 7, 2006

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   Dynamics of Voids
      "Cosmic Voids", Aspen
      June 13, 2006

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   Much Ado About Nothing: A Hierarchy of Voids
      Mykonos;
      June 19, 2003

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   A Hierarchy of Voids
      IAU Colloquium 195, Torino;
      March 12, 2004

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   Analyzing the Cosmic Foam: the Delaunay Tessellation Field Estimator
      ADAIII, Sant'Agata sui dei Golfi;
      April 29; 2004

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   Analyzing the Cosmic Foam: the Delaunay Tessellation Field Estimator
      MPIfR, Bonn, Germany;
      June 4; 2004

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   Climbing Mount Olympus: Geometry as Pathway to the Universe
      IDISIEEP, Thessaloniki;
      Dec. 5, 2003;

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   van Primordiale Ruis tot Kosmisch Schuim
      KNG, Groningen;
      Feb. 17, 2004;

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