Markov processes and Markov chains, random environments, stochastic billiards, branching processes, percolation, queueing theory.
Comets, F., Popov, S., Schütz, G., Vachkovskaia, M. Quenched invariance principle for the Knudsen stochastic billiard in a random tube.
The Annals of Probability, v. 38, p. 1019-1061, 2010.
Fribergh, A., Gantert, N., Popov, S. On slowdown and speedup of transient random walks in random environment.
Probability Theory and Related Fields, v. 147, p. 43-88, 2010.
Gantert, N., Müller, S., Popov, S., Vachkovskaia, M. Survival of branching random walks in random environment.
Journal of Theoretical Probability, v. 23, p. 1002-1014, 2010.
MacPhee, I., Menshikov, M., Petritis, D., Popov, S. Polling systems with parameter regeneration, the general case.
The Annals of Applied Probability, v. 18, p. 2131-2155, 2008.
Popov, S. Random Bulgarian solitaire.
Random Structures & Algorithms, v. 27, n. 3, p. 310-330, 2005.