PaperOrdering energy levels of interacting spin systemsElliott Lieb, Daniel MattisJournal of Mathematical Physics
PaperTheory of ferromagnetism and the ordering of electronic energy levelsElliott Lieb, Daniel MattisPhysical Review
PaperRole of Fermi surface and crystal structure in theory of magnetic metalsDaniel Mattis, Wilm E. DonathPhysical Review
