@article{TristramHemprich1995,
  author    = {Tristram, Hildegard L. C. and Hemprich, Gisbert},
  title     = {Esquisse de la situation linguistique actuelle de Fribourg-en-Brisgau},
  year      = {1995},
  language  = {fr}
}
@article{TristramCuennen1999,
  author    = {Tristram, Hildegard L. C. and C{\"u}nnen, Janina},
  title     = {Anjela Duval et Sarah Kirsch : D{\´e}sir du coeur et pour la terre},
  year      = {1999},
  language  = {fr}
}