@ARTICLE{AbsKur2006, author = "Absil, P.-A. and Kurdyka, K.", title = "On the stable equilibrium points of gradient systems", journal = "Systems Control Lett.", fjournal = "Systems \& Control Letters", year = 2006, month = "July", volume = 55, number = 7, pages = "573--577", doi = "10.1016/j.sysconle.2006.01.002", }