Graph theory and extremal combinatorics with a focus on Ramsey theory.
V. Bhat, J. Nešetřil, C. Reiher, V. Rödl, "A Ramsey Class for Steiner systems", Journal of Combinatorial Theory, Series A 154 (2018), 323-349.
V. Bhat, V. Rödl, "A short proof of the Induced Ramsey Theorem for hypergraphs", Discrete Mathematics 339(3) (2016): pp. 1147-1149.
V. Bhat, V. Rödl, "A note on upper density of quasi-random hypergraphs", The Electronic Journal of Combinatorics 20(2) (2013), #P59.