Gunther McGrath, Rita, and Atul Nerkar. “Real options reasoning and a new look at the R&D investment strategies of pharmaceutical firms.” Strategic Management Journal 25.1 (2004): 1-21.
Nerkar, Atul, and Peter W. Roberts. “Technological and product‐market experience and the success of new product introductions in the pharmaceutical industry.” Strategic Management Journal 25.8‐9 (2004): 779-799.