Singh, B. ., Kumar, S. ., Sharma, M. K. ., & S. K. Patra. (2014). Extensions of Natural Radioactivity to 4th-Type and of the Periodic Table to Super-heavy Nuclei: Contribution of Raj K Gupta to Cold Nuclear Phenomena . Journal of Nuclear Physics, Material Sciences, Radiation and Applications, 1(2), 133–143. https://doi.org/10.15415/jnp.2014.12010