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Microscopic derivation of the effective Lagrangian for skyrmions in an interacting two-dimensional electron gas at small g-factora Physikalisch-Technische Bundesanstalt, Braunschweig, Germany b Landau Institute for Theoretical Physics, Russian Academy of Sciences, prosp. Akademika Semenova 1A, Chernogolovka, Moscow Region, 142432, Russian Federation
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