1. K. Nohara, Advances in Cryogenic Engineering — Materials 28, Plenum Press, New York (1982), 117
2. M. Shimada and S. Tone, Advances in Cryogenic Engineering — Materials 34, Plenum Press, New York (1988), 131
3. M. M. Morra, Advances in Cryogenic Engineering — Materials 34, Plenum Press, New York (1988), 157
4. K. Hiraga, Advances in Cryogenic Engineering — Materials 32, Plenum Press, New York (1988), 111
5. H. Nakajima, Advances in Cryogenic Engineering — Materials 34, Plenum Press, New York (1988), 173