1. Lake Shore Cryotronics Inc. USA, Models CST-900, DRC-800 Thor Cryogenics, England, Models E3010, E3050, etc. Scientific Instruments, Lake Worth, Florida USA), Series 1800. RV-Elektronika OY (Helsinki, Finland), System AVS-45
2. Lake Shore Cryotronics Inc., Series GR200A and CGR-1 data sheets
3. A simplified accurate interpolation method for germanium resistance thermometry