Cellulose gelation in NaOH solutions is due to cellulose crystallization. Pereira, A., Duarte, H., Nosrati, P., Gubitosi, M., Gentile, L., Romano, A., Medronho, B., & Olsson, U. Cellulose, 25:3205–3210, Springer Netherlands, 2018.
bibtex   
@article{pereira2018cellulose,
  title={Cellulose gelation in NaOH solutions is due to cellulose crystallization},
  author={Pereira, Ana and Duarte, Hugo and Nosrati, Pegah and Gubitosi, Marta and Gentile, Luigi and Romano, Anabela and Medronho, Bruno and Olsson, Ulf},
  journal={Cellulose},
  volume={25},
  pages={3205--3210},
  year={2018},
  publisher={Springer Netherlands}
}

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