1. WIDDER, D. V., “The Laplace Transform”, Princeton, 1941, 1946.
2. MITRINOVIC, D. S. and J. E. PECARIC, On two-place completely monotone functions, Anzeiger Oster. Akad. Wiss. Math.-Naturwiss. Kl. 126 (1989), 85–88.
3. FINK, A. M., Kolmogorov-Landau inequalities for monotone functions, J. M.th. Anal. Appl. 90 (1982), 251–258.
4. PECARIC, J. E., Remarks on some inequalities of A. M. Fink, J. Math. Anal. Appl. 104 (1984), 428–431.
5. MITRINOVI, D. S. and J. E. PECARI, On some inequalities for monotone functions,Boll. Unione. Mat. Ital. (7) 5–13 (1991), 407416.