@article{05255154, title = {Trench's perturbation theorem for dynamic equations.}, journal = {Discrete Dynamics in Nature and Society}, volume = {2007}, year = {2007}, doi = {10.1155/2007/75672}, zbl = {1203.34151}, language = {en}, url = {http://dml.mathdoc.fr/item/05255154} }
Bohner, Martin; Stević, Stevo. Trench's perturbation theorem for dynamic equations.. Discrete Dynamics in Nature and Society, Tome 2007 (2007) . doi : 10.1155/2007/75672. http://gdmltest.u-ga.fr/item/05255154/