The s-wave repulsion and deeply bound pionic atoms: fact and fancy
  Fits to a large data set of pionic atoms show that the `missing' s-wave repulsion is accounted for when a density dependence suggested recently by Weise is included in the isovector term of the s-wave pion optical potential. The importance of using large data sets is demonstrated and the role of deeply bound pionic atom states is discussed. 
E. Friedman and A. Gal, (Hebrew U. Jerusalem)