@article{NUMA_1980__34_132667,
     author = {H. Yserentant},
     title = {Die {Mehrstellenformeln} f\"ur den {Laplaceoperator.}},
     journal = {Numerische Mathematik},
     pages = {171--188},
     publisher = {mathdoc},
     volume = {34},
     year = {1980},
     zbl = {0413.65072},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1980__34_132667/}
}