Schinkel, M., Tuinstra, J. and Ruggeberg, J. (2008). Ilinois Walls: How barring indirect purchaser suits facilitates collusion RAND Journal of Economics, 39(3):683--698.
\van den Brink\, J.R., \van der Laan\, G. and Vasil'ev, V. (2008). Extreme Points of Two Digraph Polytopes: Description and Applications in Economics and Game Theory Journal of Mathematical Economics, 44:1114--1125.
