Merton, Robert C. “On the Pricing of Corporate Debt: The Risk Structure of Interest Rates.” Journal of Finance 29, no. 2 (May 1974): 449-470. (Chapter 12 in Continuous-Time Finance.)
Merton, Robert C., and Marti G. Subrahmanyam. “The Optimality of a Competitive Stock Market.” Bell Journal of Economics and Management Science 5, no. 1 (spring 1974): 145-170
Merton, Robert C. "Analytical Optimal Control Theory as Applied to Stochastic and Non-Stochastic Economics" Ph.D. diss., Massachusetts Institute of Technology, 1970.
Merton, Robert C. “A Dynamic General Equilibrium Model of the Asset Market and Its Application to the Pricing of the Capital Structure of the Firm.” MIT Sloan School of Management Working Paper Series, No. 497-70, December 1970. (Chapter 11 in Continuous-Time Finance.)