@misc{Schrohe1995,
  author    = {Schrohe, Elmar},
  title     = {Schulze, B.-W., Pseudo-Differential Boundary Value Problems, Conical Singularities, and Asymptotics; Berlin, Akademie-Verl., 1995},
  year      = {1995},
  language  = {en}
}
@misc{Boelling1995,
  author    = {B{\"o}lling, Reinhard},
  title     = {Tuschmann, W., Hawig, P., Sofia Kowalewskaja, ein Leben f{\"u}r Mathematik und Emanzipation; Basel [u.a.], Birkh{\"a}user, 1993},
  year      = {1995},
  language  = {de}
}