@inproceedings{inproceedings3bf09f39,
title   = {Impasse bifurcations of constrained systems},
author = {Llibre, Jaume and Sotomayor, Jorge and Zhitomirskii, Michail},
year = {2002},
publisher = {AMS},
booktitle   = {Conference on Differential Equations and Dynamical Systems}
}