@article{NUMA_1986__50_133155,
     author = {Ulrich Langer},
     title = {Zur numerischen {L\"osung} des ersten biharmonischen {Randwertproblems.}},
     journal = {Numerische Mathematik},
     pages = {291--310},
     publisher = {mathdoc},
     volume = {50},
     year = {1986},
     zbl = {0597.65081},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1986__50_133155/}
}