DOUBLE UNSATURATED HeII BATHS FOR NESTING SUPERCONDUCTING SOLENOIDS PRODUCING FIELDS GREATER THAN 14 T G. Faure-Brac, A. S. Greenberg, B. Hébral et J. C. VallierJ. Phys. Colloques, 45 C1 (1984) C1-75-C1-78DOI: https://doi.org/10.1051/jphyscol:1984116