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Gonska, Journal of Approximation Theory and Its Applications 4 (1988) 95–108.","bibtex":"@article{Badea_Badea_Cottin_Gonska_1988, title={Notes on degree of approximation of B-continuous and B-differentiable functions.}, volume={4}, journal={Journal of Approximation Theory and its Applications}, author={Badea, Catalin and Badea, Ioan and Cottin, Claudia and Gonska, Heinz H.}, year={1988}, pages={95–108} }","ama":"Badea C, Badea I, Cottin C, Gonska HH. 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A note on construction of preconditioners in solving 3D elliptic problems by substructuring. <i>Comptes Rendus de l’Academie Bulgare des Sciences</i>. 1988;41(7):33-36.","bibtex":"@article{Vassilevski_Petrova_1988, title={A note on construction of preconditioners in solving 3D elliptic problems by substructuring}, volume={41}, number={7}, journal={Comptes Rendus de l’Academie Bulgare des Sciences}, author={Vassilevski, P. S. and Petrova, Svetozara}, year={1988}, pages={33–36} }","mla":"Vassilevski, P. S., and Svetozara Petrova. “A Note on Construction of Preconditioners in Solving 3D Elliptic Problems by Substructuring.” <i>Comptes Rendus de l’Academie Bulgare Des Sciences</i>, vol. 41, no. 7, 1988, pp. 33–36.","ieee":"P. S. Vassilevski and S. 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