1. i>There are infinitely many Carmichael numbers;W. R. Alford, A. Granville, C. Pomerance;Ann. Math.
2. i>Regular subgraphs of almost regular graphs;N. Alon, S. Friedland, G. Kalai;J. Combin. Theory Ser. B
3. G. Bhowmik, J.-C. Schlage-Puchta, Davenport's constant for groups of the form $\mathbb{Z}_3\oplus \mathbb{Z}_3 \oplus \mathbb{Z}_{3d}$,
4. i>A problem on semi-groups
5. K. Cziszter, M. Domokos, A. Geroldinger, The Interplay of Invariant Theory with Multiplicative Ideal Theory and with Arithmetic Combinatorics.