Two regimes in the magnetic field response of superconducting MgB2A. Kohen, F. Giubileo, Th. Proslier, F. Bobba, A. M. Cucolo, W. Sacks, Y. Noat, A. Troianovski and D. RoditchevEur. Phys. J. B, 57 1 (2007) 21-25DOI: https://doi.org/10.1140/epjb/e2007-00156-9