Patent Now or Later? Corporate Financing Decisions, Agency Costs and Social Benefits
Ricardo Correia, Sydney Howell, Peter Duck
European Journal Of Finance, vol. 20, 2014, p. 419-445.

Variation and Covariation between Market Timing and Selectivity: An Alternative to Traditional Meta-analysis
Sydney Howell, Manuel Rocha Armada
International Journal Of Business, vol. 5, 2000, p. 57-96.