2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/23268Experimental data on quantum phase transitions in two-dimensional systems (superconductor-insulator, metal-insulator, and transitions under conditions of integer quantum Hall effect) are critically analyzed.13 pages, 16 figuresMesoscale and Nanoscale PhysicsSoft Condensed Mattertext