Systematic study of proton radioactivity of spherical proton emitters within various versions of proximity potential formalismsJun-Gang Deng, Xiao-Hua Li, Jiu-Long Chen, Jun-Hao Cheng and Xi-Jun WuEur. Phys. J. A, 55 4 (2019) 58DOI: https://doi.org/10.1140/epja/i2019-12728-0