Geodesic
On calculation of the relative index of zero fixed point in the degenerate case
Trudy Instituta matematiki, Tome 16 (2008) no. 2, pp. 3-13

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Formulae for the relative index of zero fixed point for completely continuous operator $A$, whose domain and image are situated in a closed convex set $Q$ of a Banach space, are given. The case is considered where $A$ has a Fréchet derivative at zero and the operator of derivative has a mere eigenvector corresponding to the eigenvalue $1$. 
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     author = {A. V. Guminskaya},
     title = {On calculation of the relative index of zero fixed point in the degenerate case},
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A. V. Guminskaya. On calculation of the relative index of zero fixed point in the degenerate case. Trudy Instituta matematiki, Tome 16 (2008) no. 2, pp. 3-13. http://geodesic.mathdoc.fr/item/TIMB_2008_16_2_a0/