Phase transition of surface models with intrinsic curvature H. Koibuchi, N. Kusano, A. Nidaira, Z. Sasaki and K. Suzuki Eur. Phys. J. B, 42 4 (2004) 561-566 Published online: 18 January 2005 DOI: 10.1140/epjb/e2005-00015-9