A $SU(4)\otimes O(3)$ scheme for nonstrange baryons
  We show that nonstrange baryon resonances can be classified according to multiplets of $SU(4)\otimes O(3)$. We identify spectral regularities and degeneracies that allow us to predict the high spin spectrum from 2 to 3 GeV. 
P. Gonzalez, J. Vijande, A. Valcarce, H. Garcilazo