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(with B. Pavlov) Eigenfrequences and eigenfunctions of the
Laplacian with Neumann boundary conditions in a system of two
coupled resonators, Theoretical and Mathematical Physics, Vol. 100
(1994), 1065--1074.

(with B. Simon) Rank one perturbations in infinitesmal
coupling, Journal
of Functional Analysis, Vol. 130(1)
(1995), 345--356.

Some examples in one-dimensional "geometric" scattering on manifolds,
Journal of
Mathematical Analysis and Applications, Vol. 212 (1997), 263--280.

An interpolation theorem related to a.e. convergence of integral operators,
Proceedings of the AMS, Vol. 127 (1999), pp. 1781-1788.