Quantum Spin Chains and Conformally Invariant Non-Linear σ-Models

On the application of the Non-linear sigma model to spin chains and spin ladders

Edge states and conformal boundary conditions in super spin chains and super sigma models

Critical behaviour of SU(n) quantum chains and topological non-linear σ-models

Exact critical exponents for quantum spin chains, non-linear σ-models at θ=π and the quantum hall effect

Topological term in the non-linear σ model of the SO(5) spin chains

One-Dimensional Quantum Spin-1/2 Chain Models