@article{NUMA_1980__35_186303,
     author = {H. Esser and K. Niederdrenk},
     title = {Nicht\"aquidistante {Diskretisierungen} von {Randwertaufgaben.}},
     journal = {Numerische Mathematik},
     pages = {465--478},
     publisher = {mathdoc},
     volume = {35},
     year = {1980},
     zbl = {0426.65042},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1980__35_186303/}
}