Hellwig, Martin Max Planck Institute for Research on Collective Goods, Max Planck Society;
http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2031204 (Any fulltext)
Admati, A. R., DeMarzo, P. M., Hellwig, M., & Pfleiderer, P. (2012). Debt Overhang and Capital Regulation.