@article {Ferrer:January 2002:0022-247X:322,
	author = "Ferrer J.",
	title = "Rolles Theorem for Polynomials of Degree Four in a Hilbert Space",
	journal = "Journal of Mathematical Analysis and Applications",
	volume = "265",
	year = "January 2002",
	abstract = "<P>In an infinite-dimensional real Hilbert space, we introduce a class of fourth-degree polynomials which do not satisfy Rolle&#039;s Theorem in the unit ball. Extending what happens in the finite-dimensional case, we show that every fourth-degree polynomial defined by a compact operator satisfies Rolle&#039;s Theorem. <B>&#169; 2002 Elsevier Science.</B></P>",
	pages = "322-331(10)",
	url = "http://www.ingentaconnect.com/content/ap/ay/2002/00000265/00000002/art07708"
}