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L.  Foglia, Capotondi, F., Mincigrucci, R., Naumenko, D., Pedersoli, E., Simoncig, A., Kurdi, G., Calvi, A., Manfredda, M., Raimondi, L., Mahne, N., Zangrando, M., Masciovecchio, C., and Bencivenga, F., ?First Evidence of Purely Extreme-Ultraviolet Four-Wave Mixing?, Physical Review Letters, vol. 120, 2018.\par \par }