@misc{Lledo1999,
  author    = {Fernando Lled{\´o}},
  title     = {Contributions to operator theory in spaces with an indefinite metric, the Heinz Langer anniversary volume, A. S. Dijksma ... eds.; Basel [u.a.], Birkh{\"a}user, 1998, ISBN 3-7643-6003-8},
  institution = {Institut f{\"u}r Mathematik},
  type      = {review},
  year        = {1999},
}