A REFRIGERATOR WITH A DOUBLE NUCLEAR STAGE FOR RESEARCH ON SUPERFLUID 3He A. I. Ahonen, W. J. Gully, O. V. Lounasmaa et M. C. VeuroJ. Phys. Colloques, 39 C6 (1978) C6-1153-C6-1154DOI: https://doi.org/10.1051/jphyscol:19786510
