@article{GDZPPN001177311, title = {On the Numerical Treatment of a Small Divisor Problem.}, journal = {Numerische Mathematik}, volume = {39}, year = {1982}, pages = {269-292}, zbl = {0497.65047}, url = {http://dml.mathdoc.fr/item/GDZPPN001177311} }
Zehnder, E.; Braess, D. On the Numerical Treatment of a Small Divisor Problem.. Numerische Mathematik, Tome 39 (1982) pp. 269-292. http://gdmltest.u-ga.fr/item/GDZPPN001177311/