@article{CTT100633001,
  author = {R. Nomura and H. Matsuda and R. Masumoto and K. Ueno and Y. Okuda},
  title = {Macroscopic Quantum Tunneling and Avalanche Size Distribution of 4He Crystallization in Aerogel},
  journal = {J. Phys. Soc. Jpn.},
  year = 2011,
}

@article{CTT100617391,
  author = {R. Masumoto and K. Ueno and H. Matsuda and R. Nomura and Y. Okuda},
  title = {Dynamical Transition of 4He Crystallization in a Very High Porosity Aerogel},
  journal = {J. Low Temp. Phys.},
  year = 2011,
}