The masses of the mesons and baryons. Part IV. Integer multiple rule   extension
  It is shown that the empirical rule that the masses of the stable mesons and baryons of the gamma-branch are integer multiples of the mass of the pi0 meson with a maximal deviation of 3.3% holds also for the meson and baryon resonances, regardless whether the spin of the particles is 0 or 1/2. It is also shown that the masses of the particles with weak decay are integer multiples of the mass of the charged mesons times a common factor 0.853. 
E. L. Koschmieder