New sum rules for nucleon and trinucleon total photoproduction   cross-sections
  Two new sum rules are derived relating Dirac radii and anomalous magnetic moments of the considered strongly interacting fermions with the convergent integral over a difference of the total proton and neutron, as well as $He^3$ and $H^3$, photoproduction cross-sections. 
S. Dubnicka, E. Bartos, E. Kuraev