Structural investigations of N-methylformamide-water mixtures at various concentrations Ferid Hammami, Abir Chebaane, Mohamed Bahri and Salah Nasr Eur. Phys. J. E, 36 11 (2013) 129 Published online: 21 November 2013 DOI: 10.1140/epje/i2013-13129-5