@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/