I guess you'd want the popular opposite to the left that argues for income distribution to bring baout more equality. Try the Mises institute, I'm sure they have free articles and even books on the subject. That's the database for Austrian economists. You could try the Chicago school with guys like Friedman.
Just a simple Google search gives this: http://macaulay.cuny.edu/eportfolios/thorne15/files/2015/03/Cole-Milton-Friedman-on-Income-Inequaity.pdf
Just a simple Google search gives this: http://macaulay.cuny.edu/eportfolios/thorne15/files/2015/03/Cole-Milton-Friedman-on-Income-Inequaity.pdf