Faddeev eigenfunctions for point potentials in two dimensions
  We present explicit formulas for the Faddeev eigenfunctions and related generalized scattering data for point (delta-type) potentials in two dimensions. In particular, we obtain the first explicit examples of such eigenfunctions with contour singularity in spectral parameter at a fixed real energy. 
Piotr Grinevich, Roman Novikov (CMAP)
math-ph math.AP math.MP