TY - GEN AU - UHLIG, K T1 - HE-3/HE-4 DILUTION REFRIGERATOR WITHOUT A PUMPED HE-4 STAGE CY - PY - 1987 PB - T3 - Cryogenics VL - 27 UR - http://dx.doi.org/10.1016/0011-2275(87)90164-0 SN - 0011-2275