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4. Mei-Chu Chang, “A polynomial bound in Freiman’s theorem,” Duke Math. J. 113(3), 399–419 (2002).
5. I. Ruzsa, “An analog of Freiman’s theorem in groups,” in Structure Theory of Set Addition, Astérisque (Soc. Math. France, Montrouge, 1999), Vol. 258, pp. 323–326.