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3. Bulian, G.: Nonlinear Parametric Rolling in Regular Waves – A General Procedure for the Analytical Approximation of the GZ Curve and Its Use in Time Domain Simulations. Ocean Engineering, Vol. 32, No. 3–4, March, pp. 309–330. doi:10.1016/j.oceaneng.2004.08.008 (2005)
4. Bulian, G.: Development of analytical nonlinear models for parametric roll and hydrostatic restoring variations in regular and irregular waves. Ph.D. Thesis, DINMA – University of Trieste, March ( http://hdl.handle.net/10077/2518 ) (2006)
5. Bulian, G., Francescutto A.: Theoretical Prediction and Experimental Verification of Multiple Steady States for Parametric Roll. Proc. of the 10th International Ship Stability Workshop, 23–25 March, Daejeon, Republic of Korea, pp. 31–45 (2008)