[1] Tech Univ Cluj Napoca, Stefan Cel Mare Univ, Natl Res & Dev Inst Cryogen & Isotop Technol, Comp Elect & Automat Dept, Ramnicu Valcea, Romania
[2] Univ Politehn Bucuresti, Fac Automat Control & Comp, Natl Res & Dev Inst Cryogen & Isotop Technol, Ramnicu Valcea, Romania
[3] Natl Res & Dev Inst Cryogen & Isotop Technol, Ramnicu Valcea, Romania