@article{NUMA_1971__18_132099,
     author = {G.J. Cooper},
     title = {Error {Bounds} for {Numerical} {Solutions} of {Ordinary} {Differential} {Equations.}},
     journal = {Numerische Mathematik},
     pages = {162--170},
     publisher = {mathdoc},
     volume = {18},
     year = {1971},
     zbl = {0252.65059},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1971__18_132099/}
}