1. Bardaji I. and Grynkiewicz D. J. , Long arithmetic progressions in small sumsets, Integers 10 (2010) (electronic).
2. Sums in the grid
3. Inverse problems of additive number theory VI: on the addition of finite sets III;Freiman;Izy. Vysh. Ucheb. Zaveb. Mathematika,1962
4. Freiman G. A. , Foundations of a Structural Theory of Set Addition, Translations of Mathematical Monographs 37, American Mathematical Society, Providence, RI, 1973.
5. COMPRESSIONS, CONVEX GEOMETRY AND THE FREIMAN–BILU THEOREM