Phase transitions in polypeptides: analysis of energy fluctuations A. V. Yakubovich, I. A. Solov'yov, A. V. Solov'yov and W. Greiner Eur. Phys. J. D, 51 1 (2009) 25-32 Published online: 21 June 2008 DOI: 10.1140/epjd/e2008-00126-y