Effect of the hydrostatic pressure on two-dimensional transport in delta-doped systems O. Oubram, M. E. Mora-Ramos and L. M. Gaggero-Sager Eur. Phys. J. B, 71 2 (2009) 233-236 Published online: 18 August 2009 DOI: 10.1140/epjb/e2009-00294-0