Role of sonication pre-treatment and cation valence in the sol-gel transition of nano-cellulose suspensions 
C. A. Maestri, M. Abrami, S. Hazan, E. Chistè, Y. Golan, J. Rohrer, A. Bernkop-Schnürch, M. Grassi, M. Scarpa & P. Bettotti
Scientific Reports 7, Article number: 11129 (2017), doi:10.1038/s41598-017-11649-4