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- [8] AUTOMATIC DEVICE FOR MAINTAINING A CONSTANT LIQUID-NITROGEN LEVEL. Instruments and Experimental Techniques (English Translation of Pribory I Tekhnika Eksperimenta), 1975, 18 (5 pt 2): : 1631 - 1632
- [9] AUTOMATIC DEVICE FOR KEEPING-UP LIQUID-NITROGEN LEVEL PRIBORY I TEKHNIKA EKSPERIMENTA, 1975, (05): : 242 - 243