Motion of a random walker in a quenched power law correlated velocity field
Physical Review E  73  026106 (2006)   cond-mat/0511008    PDF
Soumen Roy* and Dibyendu Das

Is small-world network disordered?
Physics Letters A  352  13 (2006)    cond-mat/0409012    PDF
Soumen Roy* and Somendra M. Bhattacharjee