Pointwise Lower and Upper Bounds for Eigenfunctions of Ordinary Differential Operators.
Numerische Mathematik, Tome 27 (1976), pp. 111-120.

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@article{NUMA_1976__27_132436,
     author = {T. K\"upper},
     title = {Pointwise {Lower} and {Upper} {Bounds} for {Eigenfunctions} of {Ordinary} {Differential} {Operators.}},
     journal = {Numerische Mathematik},
     pages = {111--120},
     publisher = {mathdoc},
     volume = {27},
     year = {1976},
     zbl = {0324.65040},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1976__27_132436/}
}
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%T Pointwise Lower and Upper Bounds for Eigenfunctions of Ordinary Differential Operators.
%J Numerische Mathematik
%D 1976
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T. Küpper. Pointwise Lower and Upper Bounds for Eigenfunctions of Ordinary Differential Operators.. Numerische Mathematik, Tome 27 (1976), pp. 111-120. http://geodesic.mathdoc.fr/item/NUMA_1976__27_132436/