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\begin{thebibliography}{99}
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\bibitem{Arnold}
Arnold, L. (1973) \emph{Stochastische Differentialgleichungen. Theorie und Anwendungen}. R. Oldenbourg Verlag, M\"{u}nchen, Wien. [129]
\bibitem{Ash} 
Ash, R.B. and Gardner, M.F. (1975) \emph{Topics in Stochastic Processes}. 
Academic Press, New York. [33]
\bibitem{Bachelier}Bachelier, L. (1900) Th\'{e}orie de la sp\'{e}culation.\emph{Ann. Sci. \'{E}cole Norm Sup}. {\bf{III}-17}, 21-86. Translated in: Cootner, P.H. (Ed.)(1964) The Random Character of Stock Market Prices, pp. 17-78. MIT Press, Cambridge, Mass. [33,42,175]
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