Riccardo Storti presents Research Articles relating to Photons & Gravitons at the 2005 SPIE Conference in San Diego: (1) https://www.researchgate.net/publication/241250581_Derivation_of_the_Photon_Mass-Energy_Threshold (2) https://www.researchgate.net/publication/252465171_Derivation_of_the_Photon_and_Graviton_Mass-Energies_and_Radii