Giovannini, D; Romero, J; Potoček, V; Ferenczi, G; Speirits, F; Barnett, S. M.; Faccio, D; Padgett, M. J. (2015). "Optics. Spatially structured photons that travel in free space slower than the speed of light". Science. 347 (6224): 857-60. arXiv:1411.3987 $2. Bibcode:2015Sci...347..857G. doi:10.1126/science.aaa3035. PMID25612608.
Gibson, G.; Courtial, J.; Padgett, M. J.; Vasnetsov, M.; Pas'Ko, V.; Barnett, S. M.; Franke-Arnold, S. (2004). "Free-space information transfer using light beams carrying orbital angular momentum". Optics Express. 12 (22): 5448-5456. Bibcode:2004OExpr..12.5448G. doi:10.1364/OPEX.12.005448. PMID19484105.
Giovannini, D; Romero, J; Potoček, V; Ferenczi, G; Speirits, F; Barnett, S. M.; Faccio, D; Padgett, M. J. (2015). "Optics. Spatially structured photons that travel in free space slower than the speed of light". Science. 347 (6224): 857-60. arXiv:1411.3987 $2. Bibcode:2015Sci...347..857G. doi:10.1126/science.aaa3035. PMID25612608.
Gibson, G.; Courtial, J.; Padgett, M. J.; Vasnetsov, M.; Pas'Ko, V.; Barnett, S. M.; Franke-Arnold, S. (2004). "Free-space information transfer using light beams carrying orbital angular momentum". Optics Express. 12 (22): 5448-5456. Bibcode:2004OExpr..12.5448G. doi:10.1364/OPEX.12.005448. PMID19484105.
Giovannini, D; Romero, J; Potoček, V; Ferenczi, G; Speirits, F; Barnett, S. M.; Faccio, D; Padgett, M. J. (2015). "Optics. Spatially structured photons that travel in free space slower than the speed of light". Science. 347 (6224): 857-60. arXiv:1411.3987 $2. Bibcode:2015Sci...347..857G. doi:10.1126/science.aaa3035. PMID25612608.
Gibson, G.; Courtial, J.; Padgett, M. J.; Vasnetsov, M.; Pas'Ko, V.; Barnett, S. M.; Franke-Arnold, S. (2004). "Free-space information transfer using light beams carrying orbital angular momentum". Optics Express. 12 (22): 5448-5456. Bibcode:2004OExpr..12.5448G. doi:10.1364/OPEX.12.005448. PMID19484105.
Giovannini, D; Romero, J; Potoček, V; Ferenczi, G; Speirits, F; Barnett, S. M.; Faccio, D; Padgett, M. J. (2015). "Optics. Spatially structured photons that travel in free space slower than the speed of light". Science. 347 (6224): 857-60. arXiv:1411.3987 $2. Bibcode:2015Sci...347..857G. doi:10.1126/science.aaa3035. PMID25612608.