The Meaning of Social Entrepreneurship
greg dees is a professor at stanford who focuses on issues of public service and social entrepreneurship. this is a paper he wrote (from '98) which puts social entrepreneurism in an economic context.

Blended Value website
this website is about "...what gets created when investors and organizations act to pursue their mission. Traditionally, we have thought of value as being either economic (and created by for-profit companies) or social (and created by nonprofit or non-governmental organizations). What the Blended Value Proposition states is that all organizations, whether for-profit or not, create value that consists of economic, social and environmental value components - and that investors (whether market-rate, charitable or some mix of the two) simultaneously generate all three forms of value through providing capital to organizations." i'm not totally sure what this all means, but i think this is worth checking out more. they have a few papers and a bibliography that look worthy of perusal.