1. Common Stochastic Trends in a System of Exchange Rates
2. and (1989), The Foreign Exchange Market: Theory and Econometric Evidence, Cambridge University Press, New York.
3. (1991), ‘Universal approximation bounds for superpositions of a sigmoidal function’, Technical Report No. 58, Department of Statistics, University of Illinois, Urbana-Champaign.
4. and (1990), Adaptive Algorithms and Stochastic Approximations, Springer-Verlag, Berlin.
5. Some linear and nonlinear thoughts on exchange rates