@article{GDZPPN00203543X, title = {Counterexamples in optimal quadrature.}, journal = {Aequationes mathematicae}, volume = {28}, year = {1985}, pages = {183-203}, zbl = {0615.65016}, url = {http://dml.mathdoc.fr/item/GDZPPN00203543X} }
Werschulz, Arthur G. Counterexamples in optimal quadrature.. Aequationes mathematicae, Tome 28 (1985) pp. 183-203. http://gdmltest.u-ga.fr/item/GDZPPN00203543X/