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- [13] DEVICE FOR EXTRACTING RADIOACTIVE SAMPLES FROM A REACTOR AND MAINTAINING THEM AT TEMPERATURE OF LIQUID-NITROGEN EURO-SPECTRA, 1972, 11 (03): : 88 - &
- [20] INEXPENSIVE AUTOMATIC DEVICE FOR MAINTAINING LEVEL OF LIQUID-NITROGEN IN COLD TRAPS JOURNAL OF PHYSICS E-SCIENTIFIC INSTRUMENTS, 1973, 6 (11): : 1088 - 1089