@article{AM2_1979__19_136839,
     author = {A.G. Werschulz},
     title = {Maximal order for quadratures using n evaluations {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {310--313},
     publisher = {mathdoc},
     volume = {19},
     year = {1979},
     url = {http://geodesic.mathdoc.fr/item/AM2_1979__19_136839/}
}