Irreversibility of R&D investment and the adverse effect of uncertainty: Evidence from the OECD countries
Economics Letters, Volume 71, Issue 2, May 2001, Pages 287-291
Rajeev K. Goel, Rati Ram
A methodology to incorporate uncertainty into R&D cost and performance data
Resources and Energy, Volume 11, Issue 2, February 1990, Pages 177-193
Stephen Barrager, Oliver Gildersleeve