@article{Hassler2012,
  author    = {Haßler, Gerda},
  title     = {El desarrollo de la categor{\´i}a de aspecto en la descripci{\´o}n gramatical},
  isbn      = {978-3-89323-014-3},
  year      = {2012},
  language  = {es}
}
@article{Hassler2012,
  author    = {Haßler, Gerda},
  title     = {Las ideas de Balmes sobre la filosof{\´i}a del lenguaje},
  isbn      = {978-3-89323-299-4},
  year      = {2012},
  language  = {es}
}
@article{Hassler2012,
  author    = {Haßler, Gerda},
  title     = {Textos gramaticales de referencia en la Europ del siglo XVIII},
  isbn      = {978-84-92909},
  year      = {2012},
  language  = {es}
}