1. Experimental principles and methods below 1K;Lounasmaa,1974
2. Refrigeration and thermometry below one Kelvin;Betts,1976
3. Proc of the 15th LT conf;Frossati,1978
4. Proc Hakone, Int Symp;Frossati,1978
5. An improved He3-He4 mixing chamber for single-cycle experiments.