1 Portfolio Choice in the Presence of Background Risk
John Heaton, Deborah Lucas
The Economic Journal
Volume 110, Issue 460, pages 1–26, January 2000
http://onlinelibrary.wiley.com/doi/10.1111/1468-0297.00488/abstract


2 Theory Of Portfolio Optimization In Markets With Frictions (1999)

by Jaksa Cvitanic
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.40.9078