Systematics of heavy quarkonia from Regge trajectories on $(n,M^2)$ and   $(M^2,J)$ planes
  In this paper we show that heavy quarckonium states, similar to light mesons, form Regge trajectories in $(n,M^2)$ and $(M^2,J)$ planes and the slope of these trajectories is independent on the quantum numbers of the mesons. This fact can be useful for the prediction of the masses of heavy quarkonia and the determination of the quantum numbers of the newly discovered states. 
S.S. Gershtein, A.K. Likhoded, A.V. Luchinsky