1. Princeton Mathematical Series vol. 6;Widder DV.,1941
2. Introduction to the Theory and Application of the Laplace Transformation
3. van der Pol B, Bremmer H. Operational calculus, based on the two-sided laplace integral. Cambridge: Cambridge, at the University Press; 1950.
4. Convergence rate of Post-Widder approximate inversion of the Laplace transform;Tuan VK;Vietnam J Math,2000
5. On the real inversion formula for the bilateral Laplace transform;Yakubovich S.;J Contemp Math Anal,2005