Pietrzak, Robert H., Adriana Feder, and R. Singh. "Trajectories of PTSD Risk and Resilience in World Trade Center Responders: An 8-year Prospective Cohort Study." Psychological Medicine 44, no. 1 (2014): 205-219.

Vatsa, M., R. Singh, A. Noore, and S.K. Singh. "Belief Function Theory Based Biometric Match Score Fusion: Case Studies in Multi-instance and Multi-unit Iris Verification." In Seventh International Conference on Advances in Pattern Recognition. Kolkata, India , 2009.