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Quantum phase transitions in two-dimensional systemsOsipyan Institute of Solid State Physics, Russian Academy of Sciences, Akademika Osip'yana str. 2, Chernogolovka, Moscow Region, 142432, Russian Federation Experimental data on quantum phase transitions in two-dimensional systems (superconductor-insulator, metal-insulator) and transitions in the conditions of integer quantum Hall effect are critically analyzed.
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