##  https://en.wikipedia.org/wiki/Fermi_liquid_theory

## Marginal Fermi Liquid


- 1989 [Phenomenology of the Normal State of Cu-0 High-Temperature Superconductors](https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.63.1996) 
C. M. Varma, P. B. Littlewood, and S. Schmitt-Rink and E. Abrahams and A. E. Ruckenstein

- Varma [singular Fermi liquids](https://arxiv.org/pdf/cond-mat/0103393.pdf)


- Littlewood [The “old” marginal Fermi liquid “theory”](https://plato.tp.ph.ic.ac.uk/conferences/IMSadscmt/Programme_files/MFL_Littlewood.pdf)

## http://physics.gu.se/~tfkhj/QuantumMatter/Schoefield.pdf

http://www.physics.rutgers.edu/~coleman/620/mbody/unfinished_frontier.pdf