Compressible bag model and the phase structure S. Kagiyama, S. Kumamoto, A. Minaka, A. Nakamura, K. Ohkura and S. Yamaguchi Eur. Phys. J. C, 25 3 (2002) 453-458 Published online: 20 September 2002 DOI: 10.1007/s10052-002-1024-9