Preprints
 T. Ohsawa, Symplectic Group and the Hagedorn Wave Packets, in preparation.
 T. Ohsawa, Contact Geometry of the Pontryagin Maximum Principle, in preparation.
Journal Papers
 T. Ohsawa and M. Leok, Symplectic Semiclassical Wave Packet Dynamics, Journal of Physics A: Mathematical and Theoretical, 46, 405201, 2013. [pdf]
 T. Ohsawa, Symmetry Reduction of Optimal Control Systems and Principal Connections, SIAM Journal on Control and Optimization, 51(1):96–120, 2013. [pdf]
 M. Leok, T. Ohsawa, and D. Sosa, Hamilton–Jacobi Theory for Degenerate Lagrangian Systems with Holonomic and Nonholonomic Constraints, Journal of Mathematical Physics, 53, 072905, 2012. [pdf]
 M. Leok and T. Ohsawa, Variational and Geometric Structures of Discrete Dirac Mechanics, Foundations of Computational Mathematics, 11(5):529–562, 2011. [pdf]
 T. Ohsawa, A. M. Bloch, and M. Leok, Discrete Hamilton–Jacobi Theory, SIAM Journal on Control and Optimization, 49(4):1829–1856, 2011. [pdf]

T. Ohsawa, O. E. Fernandez, A. M. Bloch, and D. V. Zenkov,
Nonholonomic Hamilton–Jacobi Theory via Chaplygin Hamiltonization,
Journal of Geometry and Physics, 61(8):1263–1291, 2011.
[pdf]
 Ranked 1st in the Top 25 Hottest Articles from Journal of Geometry and Physics (April to June 2011), and also 3rd in the same ranking full year 2011.
 T. Ohsawa and A. M. Bloch, Nonholonomic Hamilton–Jacobi Equation and Integrability, Journal of Geometric Mechanics, 1(4):461–481, 2009. [pdf]
Refereed Conference Proceedings
 T. Ohsawa, Poisson Reduction of Optimal Control Systems, The 50th IEEE Conference on Decision and Control and European Control Conference, pp. 6230–6235, 2011. [pdf]
 M. Leok and T. Ohsawa, Discrete Dirac Structures and Implicit Discrete Lagrangian and Hamiltonian Systems, In XVIII International Fall Workshop on Geometry and Physics, pp. 91–102, 1260, AIP, 07 2010
 T. Ohsawa, A. M. Bloch, and M. Leok, Discrete Hamilton–Jacobi theory and discrete optimal control, The 49th IEEE Conference on Decision and Control (CDC), 2010, pp. 5438–5443, 2010.
 T. Ohsawa and T. Ohwada, Deterministic Hybrid Computation of Rarefied Gas Flows, Rarefied Gas Dynamics: 23rd International Symposium (AIP Conference Proceedings 663), pp. 931–938, 2003.
 T. Hokazono, S. Kobayashi, T. Ohsawa, and T. Ohwada, On the Time Step Error of the DSMC, Rarefied Gas Dynamics: 23rd International Symposium (AIP Conference Proceedings 663), pp. 390397, 2003.