@article{NUMA_1989__54_3_133337,
     author = {Wilhelm Heinrichs},
     title = {Konvergenzaussagen f\"ur {Kollokationsverfahren} bei elliptischen {Randwertaufgaben.}},
     journal = {Numerische Mathematik},
     pages = {619--638},
     publisher = {mathdoc},
     volume = {54},
     number = {3},
     year = {1989},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1989__54_3_133337/}
}