Ginzburg-Landau theory and effects of pressure on a two-band superconductor: application to MgB2J. J. Betouras, V. A. Ivanov and F. M. PeetersEur. Phys. J. B, 31 3 (2003) 349-354DOI: https://doi.org/10.1140/epjb/e2003-00041-7