Comment on "No-core calculations" of the spectra of light nuclei
  We comment upon a recent work by Zheng, Barrett, Jaqua, Vary and McCarthy, concerning calculations of spectra of light nuclei with no core. It is demonstrated that the omission of particle-particle ladder diagrams in their calculations, explains the large differences between results obtained with various model spaces. 
T. Engeland, M. Hjorth-Jensen, A. Holt and E. Osnes