Monitoring the thinning dynamics of soap films by phase shift interferometry. The case of perfluoropolyether surfactantsCecilia M. C. Gambi, Maurizio Vannoni, Andrea Sordini and Giuseppe MolesiniEur. Phys. J. E, 37 2 (2014) 9DOI: https://doi.org/10.1140/epje/i2014-14009-2