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D. G. Babbitt, A summation procedure for certain Feynman integrals, Doctoral dissertation, Univ. of Michigan, 1962. See also Abstract 62T-298, Notices Amer. Math. Soc. 9 (1962), 402. MR 0144665 (26:2208)

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S. G. Brush, Functional integrals and statistical physics, U.S. Atomic Energy Comm., Tech. Rep. No. UCRL-5694-T, (1959).

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R. H. Cameron, A family of integrals serving to connect the Wiener and Feynman integrals J. Math. and Phys. 39 (1960), 126-140. MR 0127776 (23:B821)

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J. L. Doob, Semimartingales and subharmonic functions, Trans. Amer. Math. Soc. 77 (1954), 86-121. MR 0064347 (16:269a)

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E. B. Dynkin, On some transformations of Markoff processes, Dokl. Akad. Nauk. SSSR 133 (1960), 269-272. MR 0148111 (26:5620)

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R. J. Feynman, Space-time approach to nonrelativistic quantum mechanics, Rev. Modern Phys. 20 (1948), 367-387. MR 0026940 (10:224b)

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I. M. Gel'fand and A. M. Yaglom, Integration in function space and its applications in quantum physics, J. Mathematical Phys. 1 (1960), 48-69. MR 0112604 (22:3455)

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R. Getoor, Additive functionals of a Markov process, Pacific J. Math. 7 (1957), 1577-1591. MR 0094850 (20:1359)

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-, Markov operators and their associated semi-groups, Pacific J. Math. 9 (1959), 449-472. MR 0107297 (21:6022)

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E. Hille and R. S. Phillips, Functional analysis and semigroups, Amer. Math. Soc. Colloq. Publ. Vol. 31, rev. ed., Amer. Math. Soc., Providence, R.I., 1957. MR 0089373 (19:664d)

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M. Kac, On some connections between probability theory and differential and integral equations, Proc. 2nd Berkeley Symposium on Math. Statist, and Prob., Univ. of California Press, Berkeley, Calif., 1951. MR 0045333 (13:568b)

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E. W. Montroll, Markov chains, Wiener integrals and quantum theory, Comm. Pure Appl. Math. 5 (1952), 415-453. MR 0052721 (14:663g)

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B. Sz.-Nagy, Spektraldarstellung linearer Transformationen des Hilbertischen Raumes, Springer-Verlag, Berlin, 1942. MR 0213890 (35:4744)

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E. Nelson, N. R. S. Colloques sur les équations aux dérivees partielles, Paris, 1962.

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D. Ray, On the spectra of second order differential operators, Trans. Amer. Math. Soc. 77 (1954), 299-321. MR 0066539 (16:593e)

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M. Rosenblatt, On a class of Markov processes, Trans. Amer. Math. Soc. 71 (1951), 120-135. MR 0043406 (13:258f)

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V. A. Volkonskii, Additive functionals of Markov processes, Trudy Moskov. Mat. Obšč. 9 (1960), 143-189. (Russian) MR 0137154 (25:610)