Manifestation of the Upper Hubbard band in the 2D Hubbard model at low electron density von Kagan, M.Yu., Val’kov, V.V., Woelfle, P.

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Kohn–Luttinger effect and anomalous pairing in repulsive Fermi-systems at low density von Kagan, M.Yu., Efremov, D.V., Mar’enko, M.S., Val’kov, V.V.

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