1. Wave Front Propagation for KPP-Type Equations -- 1.1. Introduction -- 1.2. Wave Fronts in a Flow with Nontrivial Velocity Profile -- 1.3. Generalizations and Remarks -- 1.4. Wave Front Propagation in Anisotropic Media -- 1.5. Wave Front Propagation in a Tube with Absorbing Walls -- 1.6. Wave Front Propagation in Slowly Nonhomogeneous Media -- 1.7. RDE Systems of KPP Type -- 1.8. RDEs in Narrow Branching Channels -- References -- 2. Particle and Wave Transmission in One-Dimensional Disordered Systems -- 2.1. Introduction -- 2.2. Localization -- 2.3. Transmission Coefficient -- 2.4. Reflection and Resonances -- 2.5. Probability Distributions of Transmittivity Decrements for High Energies -- 2.6. Observable Transparency -- 2.7. Waves in the Randomly Stratified Medium -- 2.8. Disorder and Nonlinearity -- References -- 3. Asymptotic Equations for Nonlinear Hyperbolic Waves -- 3.1. Introduction -- 3.2. Hyperbolic Waves -- 3.3. Dissipation and Dispersion -- 3.4. Miscellaneous Applications -- 3.5. Diffraction -- 3.6. Other Topics -- References