They are the first original papers about the theoretical research results of dressed photon.
 H. Sakuma, I. Ojima, and M. Ohtsu, “Gauge symmetry breaking and emergence of Clebsch-dual electromagnetic field as a model of dressed photons,” Appl. Phys.A (2017) 123:750 DOI 10.1007/s00339-017-1364-9.
 H.Saigo, I. Ojima, and M. Ohtsu, “Dressed photons from the viewpoint of photon localization: the entrance to the off-shell science,” Appl. Phys.A (2017) 123:724 DOI 10.1007/s00339-017-1345-z.