@book{GrundlingLledo1999,
  author    = {Grundling, H. and Lled{\´o}, Fernando},
  title     = {Local quantum constraints},
  series = {Preprint / SFB 288, Differentialgeometrie und Quantenphysik},
  volume    = {402},
  journal   = {Preprint / SFB 288, Differentialgeometrie und Quantenphysik},
  address   = {Berlin},
  year      = {1999},
  language  = {en}
}