TY  - BOOK
AU  - Betts, D S
AU  - 
TI  - Refrigeration and thermometry below one Kelvin
U1  - 536.48 
PY  - 1976///
CY  - Sussex
PB  - Sussex University
KW  - Thermal physics
KW  - Heat
N1  -  ref.  at the end of each chap
ER  -