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CONFORMAL MAPPINGS ONTO PRESCRIBED REGIONS VIA OPTIMIZATION TECHNIQUESOPFER G.1980; NUMER. MATH.; ISSN 0029-599X; DEU; DA. 1980; VOL. 35; NO 2; PP. 189-200; BIBL. 10 REF.Article

COMPUTATION OF T-APPROXIMATIONS BY COMPLEX PLANAR SPLINESOPFER G.1982; Z. ANGEW. MATH. MECH.; ISSN 0044-2267; DDR; DA. 1982; VOL. 62; NO 5; PP. T342-T344; BIBL. 3 REF.Article

ON CERTAIN APPROXIMATIONS OF VECTOR VALUED FUNCTIONSOPFER G.1979; SER. INTERNATION. ANAL. NUMER.; CHE; DA. 1979; VOL. 51; PP. 265-271; BIBL. 9 REF.Conference Paper

AN ALGORITHM FOR THE CONSTRUCTION OF BEST APPROXIMATIONS BASED ON KOLMOGOROV'S CRITERIONOPFER G.1978; J. APPROXIM. THEORY; USA; DA. 1978; VOL. 23; NO 4; PP. 299-317; ABS. GER; BIBL. 21 REF.Article

UBER MONOTONIEERHALTUNG BEI LINEARER, RATIONALER EXTRAPOLATION = SUR LE COMPORTEMENT MONOTONE PAR EXTRAPOLATION RATIONNELLE LINEAIREOPFER G.1973; Z. ANGEW. MATH. MECH.; DTSCH.; DA. 1973; VOL. 53; NO 4; PP. 203-205; BIBL. 7 REF.; (VORTR. WISS. JAHRESTAG. GES. ANGEW. MATH. MECH.; LJUBLJANA; 1972)Conference Paper

NEW EXTREMAL PROPERTIES FOR CONSTRUCTING CONFORMAL MAPPINGSOPFER G.1979; NUMER. MATH.; DEU; DA. 1979; VOL. 32; NO 4; PP. 423-429; BIBL. 7 REF.Article

SOLVING COMPLEX APPROXIMATION PROBLEMS BY SEMIINFINITE-FINITE OPTIMIZATION TECHNIQUES: A STUDY ON CONVERGENCEOPFER G.1982; NUMER. MATH.; ISSN 0029-599X; DEU; DA. 1982; VOL. 39; NO 3; PP. 411-420; BIBL. 6 REF.Article

EVALUATION OF WEAKLY SINGULAR INTEGRALSOPFER G.1980; SER. INT. ANAL. NUMER.; ISSN 0373-3149; CHE; DA. 1980; VOL. 53; PP. 191-202; BIBL. 5 REF.Conference Paper

ON CONVERGENCE AND QUASIREGULARITY OF INTERPOLATING COMPLEX PLANAR SPLINESOPFER G; SCHOBER G.1982; MATH. Z.; ISSN 0025-5874; DEU; DA. 1982; VOL. 180; NO 4; PP. 469-481; BIBL. 6 REF.Article

NUMERICAL INTEGRATION OF WEAKLY SINGULAR FUNCTIONSANSELONE PM; OPFER G.1979; SER. INTERNATION. ANAL. NUMER.; CHE; DA. 1979; VOL. 45; PP. 11-43; BIBL. 9 REF.Conference Paper

COMPLEX CHEBYSHEV POLYNOMIALS ON CIRCULAR SECTORS WITH DEGREE SIX OR LESSGROTHKOPF U; OPFER G.1982; MATH. COMPUT.; ISSN 0025-5718; USA; DA. 1982; VOL. 39; NO 160; PP. 599-615; BIBL. 10 REF.Article

COMPLEX CHEBYSHEV POLYNOMIALS ON CIRCULAR SECTORSGEIGER C; OPFER G.1978; J. APPROXIM. THEORY; USA; DA. 1978; VOL. 24; NO 2; PP. 93-118; BIBL. 5 REF.Article

COMPLEX PLANAR SPLINESOPFER G; PURI ML.1981; J. APPROX. THEORY; ISSN 0021-9045; USA; DA. 1981; VOL. 31; NO 4; PP. 383-402; BIBL. 17 REF.Article

COMPLEX CHEBYSHEV POLYNOMIALS AND GENERALIZATIONS WITH AN APPLICATION TO THE OPTIMAL CHOICE OF INTERPOLATING KNOTS IN COMPLEX PLANAR SPLINESOPFER G; PURI ML.1983; JOURNAL OF APPROXIMATION THEORY; ISSN 0021-9045; USA; DA. 1983; VOL. 37; NO 1; PP. 89-101; BIBL. 18 REF.Article

MEDIA MEASUREMENT BY DIRECT RECORDING METHODS: STUDY WITH PHYSICIANSOPFER G; MUELLER VEEH D.1982; SEMINAR ON IMPROVING MEDIA RESEARCH. 69/1982-04-21/STOCKHOLM; NLD; AMSTERDAM: ESOMAR; DA. 1982; PP. 47-68; BIBL. 2 REF.Conference Paper

The derivation of cubic splines with obstacles by methods of optimization and optimal controlOPFER, G; OBERLE, H. J.Numerische Mathematik. 1988, Vol 52, Num 1, pp 17-31, issn 0029-599XArticle

Givens' transformation apllied to quaternion valued vectorsJANOVSKA, D; OPFER, G.BIT (Nordisk Tidskrift for Informationsbehandling). 2003, Vol 43, pp 991-1002, issn 0006-3835, 12 p., SUPArticle

Nonnegative splines, in particular of degree fiveOBERLE, H. J; OPFER, G.Numerische Mathematik. 1998, Vol 79, Num 3, pp 427-450, issn 0029-599XArticle

Uniform approximation as a numerical tool for constructing conformal mapsHARTMANN, M; OPFER, G.Journal of computational and applied mathematics. 1986, Vol 14, Num 1-2, pp 193-206, issn 0377-0427Article

Richardson's iteration for nonsymmetric matricesOPFER, G; SCHOBER, G.Linear algebra and its applications. 1984, Vol 58, pp 343-361, issn 0024-3795Article

Chebyshev-Vandermonde systemsREICHEL, L; OPFER, G.Mathematics of computation. 1991, Vol 57, Num 196, pp 703-721, issn 0025-5718Article

Explicit Faber polynomials on circular sectorsGATERMANN, K; HOFFMANN, C; OPFER, G et al.Mathematics of computation. 1992, Vol 58, Num 197, pp 241-253, issn 0025-5718, 19 p.Article

On discrete polynomial least-squares approximation in moving time windowsFUCHS, E.International series of numerical mathematics. 1999, pp 93-107, issn 0373-3149, isbn 3-7643-6137-9Conference Paper

Stieltjes polynomials and the error of Gauss-Kronrod quadrature formulasEHRICH, S.International series of numerical mathematics. 1999, pp 57-77, issn 0373-3149, isbn 3-7643-6137-9Conference Paper

A local algorithm for constructing non-negative cubic splinesFISCHER, B; OPFER, G; PURI, M. L et al.Journal of approximation theory. 1991, Vol 64, Num 1, pp 1-16, issn 0021-9045, 16 p.Article

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