Unified approach to photo and electro-production of mesons with   arbitrary spins
  A new approach to identify the independent amplitudes along with their partial wave multipole expansions, for photo and electro-production is suggested,which is generally applicable to mesons with arbitrary spin-parity. These amplitudes facilitate direct identification of different resonance contributions. 
G. Ramachandran, M.S. Vidya and J. Balasubramanyam