The Zeno's Paradox in Quantum Theory; with B. Misra, J. Math Phys. 18(4) 756 (1977).
Time Evolution of Unstable Quantum States and a Resolution of Zeno's Paradox; with C. B. Chiu and B. Misra, Phys. Rev. D 16, 520 (1977).
Decaying States as Complex Energy Eigen Vectors in Generalised Quantum Mechanics; with C. B. Chiu and V. Gorini, Phys. Rev. D18, 2914 (1978).
Spatio-temporal Development of Hadron-Nucleus Collisions; with C. B. Chiu and P. Valanju, Phys. Rev. D 21, 1304 (1980).
The Time Scale for Quantum Zeno Paradox and Proton Decay; with B. Misra and C. B. Chiu, Phys. Lett. B 117, 34 (1982)
Natural Law, Proceedings of 1983 Theoretical Physics Meeting at Amalfi (May 6-7, 1983), Dell'Universita Degli Studi Di Salerno, Italy (1984).
Decay and Evolution of the Neutral Kaon; with C. B. Chiu, Phys. Rev. D42, 3712 (1990).
Unstable Systems in Generalised Quantum Theory, with Charles B Chiu and G. Bhamathi, Advances in Chemical Physics XCIX, John Wiley & Sons, Inc. (1997), pp.121-210.
Quantum Zeno Dynamics; with P. Facchi, V. Gorini, G. Marmo, S. Pascazio, Phys. Lett. A 275, 12 (2000).
Zeno Dynamics with Constraints; with P. Facchi, G. Marmo, S. Pascazio and A. Scardicchio, J. Optics B: Quantum Optics 6, S492 (2004).