@phdthesis{5691,
  author       = {Cottin, Claudia},
  title        = {{Quantitative Aussagen zur Blending-Typ-Approximation}},
  year         = {1988},
}

@article{5645,
  author       = {Badea, Catalin and Badea, Ioan and Cottin, Claudia and Gonska, Heinz H.},
  journal      = {Journal of Approximation Theory and its Applications},
  pages        = {95--108},
  title        = {{Notes on degree of approximation of B-continuous and B-differentiable functions.}},
  volume       = {4},
  year         = {1988},
}

@article{4779,
  author       = {Vassilevski, P. S. and Petrova, Svetozara},
  journal      = {Comptes Rendus de l’Academie Bulgare des Sciences},
  number       = {7},
  pages        = {33--36},
  title        = {{A note on construction of preconditioners in solving 3D elliptic problems by substructuring}},
  volume       = {41},
  year         = {1988},
}