Business enterprises : legal structures, governance, and policy : cases, materials, and problems / Douglas M. Branson, W. Edward Sell Chair in Business Law, University of Pittsburgh School of Law; Joan MacLeod Heminway, Rick Rose Distinguished Professor of Law, University of Tennessee College of Law; Mark J. Loewenstein, Monfort Professor of Law, University of Colorado School of Law; Marc I. Steinberg, Radford Professor of Law, Southern Methodist University Dedman School of Law; Manning Gilbert Warren III, H. Edward Harter Chair of Commercial Law, University of Louisville Louis D. Brandeis School of Law