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Ludwig, Andre; Maurer, Jochen; Mayer, Benedikt; Phillips, Christopher; Gallmann, Lukas; Keller, Ursula (2014). Breakdown of the Dipole Approximation in Strong-Field Ionization. Physical review letters, 113(24), pp. 243001-1. American Physical Society 10.1103/PhysRevLett.113.243001
