Dhanya Balakrishnan, A G Umadevi, Jose.P. Abraham, M. Rajagopalan, and J Jojo, Trans., “A Study on Activity Concentration of Natural Radionuclide of Building Materials in Kochi”, Int.J. Fundam. Phys. Sci, vol. 2, no. 3, pp. 41–43, Jun. 2012, doi: 10.14331/ijfps.2012.330034.