Subadditivity tests for neutral separation with an application to US railroads /
Ivaldi, Marc.
McCullough, Gerard John.
Centre for Economic Policy Research (Great Britain)
London : Centre for Economic Policy Research,
2004.
"Industrial organization."
"May 2004."
Includes bibliographical references (p. 18-19).
Railroads and state
Also available from the CEPR World Wide Web site (www.cepr.org).