RICKER, M.; SINGULL, M. The Exponential Integral Ei(<i>x</i>) and Numerical Calculation of Its Inverse. Contemporary Mathematics , [S. l.], v. 7, n. 4, p. 4523–4547, 2026. DOI: 10.37256/cm.7420269353. Disponível em: https://ojs.wiserpub.com/index.php/CM/article/view/9353. Acesso em: 13 aug. 2026.