Bibliographical references BELLMAN, R., (1957), Dynamic Programming, Princeton University Press, Princeton (NJ). BENSOUSSAN, A., HURST, E. G. (Jr) y NASLUND, B., (1974), Management Applications of Modern Control Theory, American Elsevier, New York. COYLE. R. G., (1977), Management System Dynamics, John Wiley and Sons, Chischester (U.K.) HILLIER, F. S. y LIEBERMAN, G. J., (1967), Introduction to Operations Research, Holden Day, San Francisco. INTRIGATOR, M. D., (1971), Mathematical Optimization and Economic Theory, Prentice-Hall, Englewood Cliffs (NJ). LILIEN, G. L. Y KOTLER, P., (1983), Marketing Decision Making: A Model-Building Approach, Harper and Row, New York. LILIEN, G. L. Y RUZDIC, A. A., (1982), Analyzing Natural Experiments in Industrial Markets, en Marketing Planning Models, A. A. Zoltners (editor), North-Holland, New York, pp 241-269. NAYLOR, T. H. y VERNON, J. M., (1969), Microeconomics and Decision Models of the Firm, Harcourt, Brace & World, New York. NERLOYE, M. y ARROW K. J., (1962), Optimal Advertising Policy Under Dynamic Conditions, Economica, 39, pp. 129-142. PONTRYAGIN, L. S., BOLTYANSKII, V. G., GAMKRELIDZE, R. V. Y MISCHENKO, E. F., (1962) The Mathematical Theory of Optimal Processes, John Wiley and Sons, New York. SETHI, S. P., (1973), Optimal Control of the Vidale Wolfe Advertising Model, Operations Research, 21, pp. 998-1013. SETHI, S. P. y THOHPSON. G. L., Optimal Control Theory: Applications to Management Science, Martinus Nijhoff Publishing, Boston (MA). Tapiero, C. S., (1977), Mangerial Planning: An Optimun and Stochastic Control Approach, Gordon Breach, New York. TEICHROEW, D., (1964), An Introduction to Management Science Deterministic Models, John Wiley and Sons, New York. VIDALE, M. L. Y WOLFE, H. B., (1957), An Operations Research Study of Sales Response to Advertising, Operations Research, 5, pp. 370-381.