On field effect studies and superconductor-insulator transition in high-Tc cuprates G. Dubuis, A.T. Bollinger, D. Pavuna and I. Božović Eur. Phys. J. Special Topics, 222 5 (2013) 1217-1221 Published online: 15 July 2013 DOI: 10.1140/epjst/e2013-01916-x