An empirical strength criterion for heterogeneous tuff. Fuenkajorn, K. & Daemen, J. J. Engineering geology, 32(4):209–223, Elsevier, 1992.
bibtex   
@article{fuenkajorn1992empirical,
  title={An empirical strength criterion for heterogeneous tuff},
  author={Fuenkajorn, Kittitep and Daemen, Jaak JK},
  journal={Engineering geology},
  volume={32},
  number={4},
  pages={209--223},
  year={1992},
  publisher={Elsevier}
}

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