Why do we need numerical methods for constrained fermion systems?

Lowest-order constrained variational method for simple many-fermion systems

Finite-Temperature Constrained Path Monte Carlo Method for Fermion Systems

Simulation of constrained fermions in low-dimensional systems

Numerical methods for the thermodynamics of low-dimensional fermion systems

Constrained Path Monte Carlo method for strongly paired fermions

Model nuclear matter calculations with a new fermion lowest order constrained variational method