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Superfluidity of spatially separated electrons and holes and unbalancedtwo-layer electron system in high magnetic field is considered.  The temperature of the Kosterlitz-Thouless transition to a superfluid stateis obtained as a function of magnetic field and interlayer separation. Theequation of state for magnetoexciton system in quasi-classical regime isanalyzed. The transition from excitonic phase to electron-hole phase isconsidered.  Possible experimental manifestations of the predicted effects are brieflydiscussed.Comment: 21 pages, 3 Postscript figure

Phase transitions of electron-hole and unbalanced electron systems in coupled quantum wells in high magnetic fields