@article{NUMA_1984__44_132932,
     author = {Johann Schr\"oder},
     title = {Numerical {Error} {Bounds} for {Fourth} {Order} {Boundary} {Value} {Problems,} {Simultaneous} {Estimation} of u(x) and u},
     journal = {Numerische Mathematik},
     pages = {233--246},
     publisher = {mathdoc},
     volume = {44},
     year = {1984},
     zbl = {0536.34004},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1984__44_132932/}
}