Coherent pi0-pi0 photoproduction on lightest nuclei
  Coherent photoproduction of two neutral pions on the deuteron and ^3He is calculated. The isoscalar and isovector parts of the elementary photoproduction amplitude was determined by fitting the measured total cross section on protons and neutrons. The dependence of the cross section on the isospin of the target nucleus is discussed. 
M. Egorov, A. Fix
nucl-th