Voir la notice de l'article provenant de la source European Digital Mathematics Library
@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/} }
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/