Cerquera, Daniel und Hannes Ullrich (2010), Consumer Welfare and Unobserved Heterogeneity in Discrete Choice Models: The Value of Alpine Road Tunnels, ZEW Discussion Paper No. 10-095, Mannheim

Prady, Delphine und Hannes Ullrich (2010), Entry and Competition in Freight Transport: The Case of a Prospective Transalpine Rail Link Between France and Italy, ZEW Discussion Paper No. 10-010, Mannheim

Miklós-Thal, Jeanine und Hannes Ullrich (2009), Nomination Contests:Theory and Empirical Evidence from Professional Soccer, ZEW Discussion Paper No. 09-027, Mannheim