Below is the ascii version of the abstract for 14-22.
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Vitali Vougalter, Vitaly Volpert
On the solvability in the sense of sequences for some non Fredholm operators
ABSTRACT. We investigate solvability of certain linear nonhomogeneous elliptic equations and establish that under reasonable technical conditions the convergence in L^2(R^d) of their right sides yields the existence and the
convergence in H^2(R^d) of the solutions. The problems involve the sums of
second order differential operators without Fredholm property and we apply
the methods of spectral and scattering theory for Schroedinger type operators analogously to our previous work.