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- [5] A SEMICONDUCTOR LIQUID HELIUM LEVEL INDICATOR CESKOSLOVENSKY CASOPIS PRO FYSIKU SEKCE A, 1969, 19 (04): : 412 - &
- [7] LOW TEMPERATURE LIQUID HELIUM LEVEL INDICATOR REVIEW OF SCIENTIFIC INSTRUMENTS, 1966, 37 (09): : 1165 - &
- [8] LIQUID HELIUM LEVEL INDICATOR FOR METAL STORAGE DEWARS REVIEW OF SCIENTIFIC INSTRUMENTS, 1954, 25 (09): : 926 - 927
- [9] CONTINUOUS LIQUID-HELIUM LEVEL INDICATOR WITH A SUPERCONDUCTING FILAMENT CESKOSLOVENSKY CASOPIS PRO FYSIKU SEKCE A, 1972, A 22 (06): : 557 - &
- [10] LEVEL INDICATOR FOR PERMANENT INSTALLATION IN LIQUID HELIUM STORAGE DEWAR REVIEW OF SCIENTIFIC INSTRUMENTS, 1961, 32 (07): : 853 - &