Ramu, M., A. Shaikh, T. Muraleedharan, and T. Ramachandran. “Measurements of Indoor Radon Levels in India Using Solid State Nuclear Track Detectors: Need for Standardisation”. Defence Science Journal, Vol. 42, no. 4, Jan. 2013, pp. 219-25, doi:10.14429/dsj.42.4386.