1. A. Pais and Tai Tsun Wu, Singular potentials and peratization II (preprint)
2. G. Tiktopoulos and S.B. Treiman, Weak coupling limit for scattering by strongly singular potentials (preprint).
3. Selected topics on analyticity in potential scattering
4. H. Cornille, Determination of the S matrix for a superposition of exponential potentials singular like r−2 at the origin (CERN, preprint 8108/Th. 398).