Erratum and addendum to "Two-point b.v.p. for multivalued equations with weakly regular r.h.s."

In this paper, we define a topological index for compact multivalued maps in convex metrizable subsets of a locally convex topological vector space in order to correct the proofs of Theorems 4.1 and 4.2 in Benedetti-Malaguti-Taddei, Nonlinear Anal. 74 (2011) 3657–3670.