@phdthesis{Kaersten1998,
  author    = {K{\"a}rsten, Fatma},
  title     = {A duality for a compact group and a second cohomology of its dual},
  pages     = {76 S.},
  year      = {1998},
  language  = {en}
}
@phdthesis{Orellana1998,
  author    = {Orellana, Juan B. Gil},
  title     = {Heat trace asymptotics for cone differential operators},
  pages     = {89 S. : graph. Darst.},
  year      = {1998},
  language  = {en}
}
@phdthesis{Lledo1998,
  author    = {Lled{\´o}, Fernando},
  title     = {Algebraic properties of massless free nets},
  address   = {Potsdam},
  pages     = {101 S.},
  year      = {1998},
  language  = {en}
}