Universality in the profile of the semiclassical limit solutions to the focusing Nonlinear Schroedinger equation at the first breaking curve
Universality of Calogero-Moser model
Unnecessary Exact Solutions of Nonlinear Ordinary Differential Equations
Unraveling hidden hierarchies and dual structures in an integrable field model
Using an old method of Jacobi to derive Lagrangians: a nonlinear dynamical system with variable coefficients
Using the Continuous Spectrum to "Feel" Integrability: the Effect of Boundary Conditions