No self promotion, but after reading this paper 2 years ago, I started a series called "What Makes Them Entrepreneurial" on my blog - http://www.adeologue.com/adeologue/what_makes_them_entrepren...
You'll find approx. 34 traits of entrepreneurs that made them entrepreneurial that I've collected from different papers/blogs/books I read. The series is still ongoing - so if you find some more inputs, then let me know. I'll try to write about it.