REBERNIK RIBIČ, Primož, ROUSSEL, Eléonore, PENN, Gregory, DE NINNO, Giovanni, GIANNESSI, Luca, PENCO, G. in ALLARIA, Enrico, 2017, Echo-enabled harmonic generation studies for the FERMI free-electron laser. Photonics [na spletu]. 2017. Vol. 4, no. 1, p. 1–14. [Dostopano 7 april 2025]. Pridobljeno s: https://doi.org/10.3390/photonics4010019