"Determination of a dose-like curve for active colour centres produced in LiF single crystals by ultrashort high intensity laser pulses and a preliminary investigation of their spectral and spatial properties by confocal and atomic microscopies" (2008) Courrol, L.C.;Samad, R.E.;Martinez, O.E. (...)Vieira Junior, N.D. Journal of Optics A: Pure and Applied Optics. 10(10)

"Confocal and atomic force microscopies of color centers produced by ultrashort laser irradiation in LiF crystals" (2008) Courrol, L.C.;Martinez, O.;Samad, R.E. (...)Junior, N.D.V. 6th Ibero-American Conference onOptics and 9th Latin-American Meeting on Optics, Lasers and Applications, RIAO/OPTILAS 2007. 992:737-742