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[1] K.L. Chung, Lectures from Markov Process to Brownian Motion, Springer-Verlag 1982.
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[2] K.L. Chung and K.M. Rao, Feynman-Kac functional and the Schrödinger equation, Seminar in Stochastic Process 1 (1981), 1-29.
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[3] K.L. Chung and R.J. Williams, Introduction to Stochastic Integration, Birkhäuser, 1983.
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[4] L. Hörmander, The analysis of Linear Partial Differential Operators, 3 (1985) Springer-Verlag.
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[5] S. Kakutani, Two-dimensional Brownian motion and harmonic functions, Proc. Imp. Acad. Tokyo 22 (1944), 706-714.