1999 SEN GUPTA, Amitava (b. 1953) Ph.D.,F.I.E.T.E., Scientist – F, National Physical Laboratory, K.S. Krishnan Marg, New Delhi – 110012; Res. K-2072, Chittaranjan Park, New Delhi – 110019; Tel: 011-25787161 Ext.2343, 25851506(O), 26463667(R); Sp. Radio Physics/Electronics/Time & Freq. Standards.