Energy Centroids in the presence of random interactions
  In this paper we study energy centroids such as those with fixed spin and isospin, those with fixed irreducible representations for bosons, in the presence of random two-body and/or three-body interactions. Our results show that regularities of energy centroids of fixed spin states reported in earlier works are more robust than expected. 
Y.M.Zhao, A.Arima, N.Yoshida, K.Ogawa, N.Yoshinaga, V.K.B.Kota