@phdthesis{Guerra07:PhD,
  author = {Esther Guerra},
  title  = {Especificaci\'on, An\'alisis y Generaci\'on de Entornos para Lenguajes Visuales de Dominio Espec\'ifico},
  school = {Polytechnic School, Computer Science Department, Universidad Aut\'onoma of Madrid},
  year   = {2007},
  month  = {December},
  source = {http://astreo.ii.uam.es/~eguerra/papers/Guerra_2007_PhD.zip},
}