Fermi liquid theory was later developed by which theoretical physicist of Soviet, Russian and American background?
Fermi liquid theory:  The phenomenological theory of Fermi liquids was introduced by the Soviet physicist Lev Davidovich Landau in 1956, and later developed by Alexei Abrikosov and Isaak Khalatnikov using diagrammatic perturbation theory. Alexei Alexeyevich Abrikosov: Alexei Alexeyevich Abrikosov (Russian: Алексе́й Алексе́евич Абрико́сов ; 25 June 1928 – 29 March 2017) was a Soviet, Russian and American theoretical physicist whose main contributions are in the field of condensed matter physics.
Alexei Alexeyevich Abrikosov