1. Açıkmeşe, A.B. (2002). Stabilization, observation, tracking and disturbance rejection for uncertain/nonlinear and time-varying systems. Ph.D. thesis. Purdue University. December.
2. Açıkmeşe, A.B., & Corless, M. (2003). Stability analysis with quadratic Lyapunov functions: a necessary and sufficient multiplier condition. In Proceedings of Allerton conference on communication, control, and computing.
3. Homogeneous approximation, recursive observer design and output feedback;Andrieu;SIAM Journal on Control and Optimization,2008
4. A Lyapunov approach to incremental stability properties;Angeli;IEEE Transactions on Automatic Control,2002
5. Arcak, M., & Kokotovic, P. (1999). Nonlinear observers: a circle criterion design. In Proceedings of 38th IEEE conference on decision and control (pp. 4872–4876).