1. Why Has IPO Underpricing Changed Over Time
http://www.jstor.org/pss/3666262

2. How Investment Bankers Determine the Offer Price and Allocation of New Issues
http://www.sciencedirect.com/science/article/B6VBX-45DMXG9-6/2/3b3d1567636b8846fac1b43f436504b3