@article{NUMA_1972__20_132175,
     author = {Rainer Kre{\ss}},
     title = {Zur numerischen {Integration} periodischer {Funktionen} nach der {Rechteckregel.}},
     journal = {Numerische Mathematik},
     pages = {87--92},
     publisher = {mathdoc},
     volume = {20},
     year = {1972},
     zbl = {0231.65026},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1972__20_132175/}
}