Bibliographical references ALONSO, J. (1986): "Una introducción a los mercados de opciones", Información Comercial Española, nº 633, mayo. BLACK, F. and SCHOLES, M. (1973): "The Pricing of Opions and Corporate Liabilities", Journal of Political Economy, v. 81, nº 3, may.-jun. CHAMBERLAIN, G. (1982) : Trading jn Options, Woodhead Faulkner, Cambridge. CHICAGO BOARD OPTIONS EXCHANGE (1985): Characteristics and Risks of Standaried Options, CBOE, Chicago. III. CHICAGO BOARD OPTIONS EXCHANGE (1986): How to Make the Market Work for You Without Buying a Single Stock, CBOE, Chioago. III. LATANE, H. A. and RENDLEMAN, R. J. (1976): "Standard Deviations oF Stock Price Ratios Implied in Option Prices", Journal of Finance, v. 31, nº 2, may. MERTON, R. C. (1973): "Theory of Rational Option Pricing", Bell Journal of Economics and Management Science, v. 4, nº 1, primavera. STOLL, H. R. (1969): "The Relationship between Put and Call Options Prices", Journal of Finance, v. 24, nº 5, dic. SUÁREZ, A. S. (1986) : Decisiones Optimas de Inversión y financiación en la Empresa, Pirámide. Madrid. THE PHILADELPHIA STOCK EXCHANGE (1986): Options on the Value Line Composite Index, PHLX, Philadelphia.