@article{4777,
  author       = {Vassilevski, P. S. and Petrova, Svetozara and Lazarov, R. D.},
  journal      = {Mathematica Balkanica},
  pages        = {179--196},
  title        = {{Preconditioning elliptic problems on grids with multilevel local refinement}},
  volume       = {8},
  year         = {1994},
}

@inproceedings{4778,
  author       = {Brand, C. and Petrova, Svetozara},
  booktitle    = {Advances in Numerical Methods and Applications: Proceedings of the Third International Conference},
  editor       = {Dimov, I. T.  and Sendov, Bl.  and Vassilevski, P. S.},
  isbn         = {978-9810219260},
  location     = {Sofia, Bulgaria},
  title        = {{Computing extreme eigenvalues of large sparse symmetric problems}},
  year         = {1994},
}

@article{1161,
  author       = {Büchel, Felix and Pannenberg, Markus},
  issn         = {2366-049X},
  journal      = {Jahrbücher für Nationalökonomie und Statistik},
  number       = {3},
  publisher    = {Walter de Gruyter GmbH},
  title        = {{On-the-Job Training, innerbetriebliche Karrierepfade und Einkommensentwicklung / On-the-Job Training, Promotion and Earnings Dynamics Observed Within Firms}},
  doi          = {10.1515/jbnst-1994-0303},
  volume       = {213},
  year         = {1994},
}

@article{5636,
  author       = {Cottin, Claudia},
  issn         = {1420-9012},
  journal      = {Results in Mathematics},
  number       = {3-4},
  pages        = {211--221},
  publisher    = {Springer Science and Business Media LLC},
  title        = {{Directional K- Functionals}},
  doi          = {10.1007/BF03322331},
  volume       = {24},
  year         = {1993},
}

@article{5637,
  author       = {Cottin, Claudia},
  issn         = {2196-6753},
  journal      = {Analysis},
  number       = {1-2},
  pages        = {185--200},
  publisher    = {Walter de Gruyter GmbH},
  title        = {{Directional extensions of univariate operators and Boolean sum approximation}},
  doi          = {10.1524/anly.1993.13.12.185},
  volume       = {13},
  year         = {1993},
}

@inproceedings{5649,
  author       = {Cottin, Claudia and Gonska, Heinz H. },
  booktitle    = {Proceedings of the Second International Conference in Functional Analysis and Approximation Theory},
  location     = {Acquafredda di Maratea (Potenza)},
  title        = {{Simultaneous approximation and global smoothness preservation}},
  year         = {1993},
}

@inproceedings{5656,
  author       = {Badea, Catalin and Cottin, Claudia},
  booktitle    = {Proc. Conf. "Approximation Theory" Kecskemét 1990, Colloquia Mathematica Societatis Janos Bolyai 58},
  location     = {Kecskemét},
  pages        = {51--68},
  title        = {{Korovkin-type theorems for generalized Boolean sum operators}},
  year         = {1992},
}

@inproceedings{5739,
  author       = {Cottin, Claudia},
  booktitle    = {Constructive Theory of Functions, Proc. Conf. Varna 1991},
  editor       = {Ivanov, K.G. and Petrushev, P.P. and Sendov, B.H. and Popov, V.A.},
  location     = {Varna},
  pages        = {77--83},
  title        = {{A Jackson-type theorem on approximation by bounded trigonometric blending polynomials}},
  year         = {1992},
}

@inproceedings{5740,
  author       = {Cottin, Claudia and Gonska, Heinz H.},
  booktitle    = {Constructive Theory of Functions, Proc. Conf. Varna 1991},
  editor       = {Ivanov, K.G. and Petrushev, P.P. and Sendov, B.H. and Popov, V.A.},
  location     = {Varna},
  pages        = {85--91},
  title        = {{A note on global smoothness preservation by Boolean sum operators}},
  year         = {1992},
}

@article{5560,
  author       = {Carstensen, Vivian},
  issn         = {2366-049X},
  journal      = {Jahrbücher für Nationalökonomie und Statistik},
  number       = {5-6},
  pages        = {445--456},
  publisher    = {Walter de Gruyter GmbH},
  title        = {{Hierarchien: Status und Entlohnung/On the Pareto-Efficiency of Profit-Sharing-Contracts}},
  doi          = {10.1515/jbnst-1992-5-606},
  volume       = {210},
  year         = {1992},
}

@article{4546,
  author       = {Vassilevski, P. S. and Petrova, Svetozara and Lazarov, R. D.},
  issn         = {2168-3417},
  journal      = {SIAM Journal on Scientific and Statistical Computing},
  number       = {6},
  pages        = {1287--1313},
  publisher    = {Society for Industrial & Applied Mathematics (SIAM)},
  title        = {{Finite Difference Schemes on Triangular Cell-Centered Grids with Local Refinement}},
  doi          = {10.1137/0913073},
  volume       = {13},
  year         = {1992},
}

@article{1162,
  author       = {Pannenberg, Markus and Büchel, Felix},
  journal      = {Mitteilungen aus der Arbeitsmarkt- und Berufsforschung},
  pages        = {544--552},
  publisher    = {W. Kohlhammer GmbH},
  title        = {{‘Neue Selbständige’ in Ostdeutschland. Statusentscheidung, Realisierungschancen und materielle Zufriedenheit}},
  volume       = {25},
  year         = {1992},
}

@article{1163,
  author       = {Pannenberg, Markus and Büchel, Felix},
  journal      = {Mitteilungen aus der Arbeitsmarkt- und Berufsforschung},
  pages        = {158--167},
  publisher    = {W. Kohlhammer GmbH},
  title        = {{Erwerbsbiographische Folgerisiken von Kurzarbeit und Arbeitslosigkeit. Eine empirische Analyse für Ostdeutschland}},
  volume       = {25},
  year         = {1992},
}

@inproceedings{5658,
  author       = {Cottin, Claudia},
  booktitle    = {Function Spaces, Proc. Conf. Poznan 1989},
  pages        = {152--161},
  publisher    = {Teubner},
  title        = {{Approximation by bounded pseudo-polynomials}},
  year         = {1991},
}

@inproceedings{5738,
  author       = {Anastassiou, Claudia and Cottin, Claudia and Gonska, Heiner},
  booktitle    = {Israel Mathematical Conference Proceedings, Vol. IV},
  editor       = {Baron, S. and Leviatan, D.},
  pages        = {31--44},
  title        = {{Global smoothness preservation by multivariate approximation operators}},
  year         = {1991},
}

@article{4480,
  author       = {Anastassiou, George A. and Cottin, Claudia and Gonska, Heinz H.},
  issn         = {2196-6753},
  journal      = {Analysis},
  number       = {1},
  publisher    = {Walter de Gruyter GmbH},
  title        = {{Global smoothness of approximating functions}},
  doi          = {10.1524/anly.1991.11.1.43},
  volume       = {11},
  year         = {1991},
}

@inproceedings{5659,
  author       = {Cottin, Claudia and van Damme, Ruud},
  booktitle    = {The Mathematics of Surfaces III, Proc. Conf. Bath 1990},
  editor       = {Handscomb, David Christopher },
  isbn         = {978-0198536291},
  location     = {Bath},
  publisher    = {Oxford University Press},
  title        = {{3D reconstruction of closed objects by piecewise cubic Bézier patches}},
  year         = {1990},
}

@article{5639,
  author       = {Cottin, Claudia},
  issn         = {1432-1823},
  journal      = {Mathematische Zeitschrift},
  number       = {1},
  pages        = {69--83},
  publisher    = {Springer Science and Business Media LLC},
  title        = {{Mixed K-functionals: A measure of smoothness for blending-type approximation}},
  doi          = {10.1007/BF02570860},
  volume       = {204},
  year         = {1990},
}

@inproceedings{5657,
  author       = {Cottin, Claudia},
  booktitle    = {Approximation Theory VI, Proc. Conf. College Station (Texas)},
  editor       = {Chui, C. K. and Schumaker, Larry L. and Ward, J. D. },
  location     = {Texas A & M University},
  pages        = {149--152},
  publisher    = {Academic Press},
  title        = {{Inverse theorems for blending-type approximation}},
  year         = {1989},
}

@article{5653,
  author       = {Badea, C. and Badea, Irinel Adriana and Cottin, Claudia},
  journal      = {Revue d'Analyse Numérique et de la Théorie de l'Approximation},
  pages        = {7--17},
  title        = {{A Korovkin-type theorem for generalizations of Boolean sum operators and approximation by trigonometric pseudopolynomials}},
  volume       = {17},
  year         = {1988},
}