Below is the ascii version of the abstract for 14-22. The html version should be ready soon.

Vitali Vougalter, Vitaly Volpert
On the solvability in the sense of sequences for some non Fredholm operators
(193K, pdf)

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.