R. H. Cameron, D. A. Storvick, Some Banach algebras of analytic Feynman integrable functions, in Analytic Functions (Kozubnik 1979), J. Ławrynowicz (ed.), Lecture ...
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Vol. 258, No. 1294 (Oct. 25, 1960), pp. 402-411 (10 pages) Some years ago the author proved that explicit ...