Two-pion exchange NN potential from Lorentz-invariant $\chi$EFT
  We outline the progress made in the past five years by the S\~ao Paulo group in the development of a two-pion exchange nucleon-nucleon potential within a Lorentz-invariant framework of (baryon) chiral perturbation theory. 
Renato Higa, Manoel R. Robilotta, Carlos A. da Rocha