Asymptotics of the Weyl Function for Schr\"odinger Operators with   Measure-Valued Potentials
  We derive an asymptotic expansion for the Weyl function of a one-dimensional Schr\"odinger operator which generalizes the classical formula by Atkinson. Moreover, we show that the asymptotic formula can also be interpreted in the sense of distributions. 
Annemarie Luger, Gerald Teschl, and Tobias W\"ohrer
math.SP math-ph math.MP