Characteristic length scales of the secondary relaxations in glass-forming glycerol S. Gupta, E. Mamontov, N. Jalarvo, L. Stingaciu and M. Ohl Eur. Phys. J. E, 39 3 (2016) 40 Published online: 29 March 2016 DOI: 10.1140/epje/i2016-16040-7