1. Superconducting magnet for K-500 cyclotron at VECC, Kolkata;Saha;Cryogenics,2009
2. Operating experience with the Michigan state university superconducting cyclotron cryogenic system;Mallory,1979
3. Leak tightness of LHC cold vacuum system;Crukhsank,2011
4. Detection of unapproachable leaks in VECC K-500 superconducting cyclotron;Dutta,2013
5. Operational experience of superconducting cyclotron at VECC;Bhunia,2010