Uncertainties in the empirical formulae for alpha decay half-lives of heavy and superheavy nuclei H. C. Manjunatha, L. Seenappa and K. N. Sridhar Eur. Phys. J. Plus, 134 9 (2019) 477 Published online: 30 September 2019 DOI: 10.1140/epjp/i2019-12838-0