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@article{AM2_1985__29_137093, author = {Arthur G. Werschulz}, title = {Counterexamples in optimal quadrature.}, journal = {Aequationes mathematicae}, pages = {183--203}, publisher = {mathdoc}, volume = {29}, year = {1985}, zbl = {0615.65016}, url = {http://geodesic.mathdoc.fr/item/AM2_1985__29_137093/} }
Arthur G. Werschulz. Counterexamples in optimal quadrature.. Aequationes mathematicae, Tome 29 (1985), pp. 183-203. http://geodesic.mathdoc.fr/item/AM2_1985__29_137093/