1. Berg, E. J., Heaviside's operational calculus as applied to Engineering and Physics, New York 1936.
2. Introduction to the Operational Calculus;Berg,1967
3. Integration von Funktionen, deren Werte die Elemente eines Vektorraumes sind;Bochner;Fund. Math.,1933
4. On Mikusiński operators;Boehme;Studia Math.,1969
5. On sequences of continuous functions and convolution;Boehme;Studia Math.,1965