@article{AM2_1978__17_136758,
     author = {Helmut Brass},
     title = {Converse theorems for the trapezoidal rule. {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {384--385},
     publisher = {mathdoc},
     volume = {17},
     year = {1978},
     url = {http://geodesic.mathdoc.fr/item/AM2_1978__17_136758/}
}