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Alfen, Hans Wilhelm. "Public Private Partnerships - The German Experience." In Outsourcing of Publicly Owned Real Estate in Europe - The Public Private Partnership Experience. ERES: Industry Seminar. Paris, France: ESSEC Business School, 2005.

Alfen, Hans Wilhelm, and Katrin Fischer. "Shaping the Process: Initiatives, Standards and Projects for Public Private Partnerships in Germany." In Book of Abstracts: 2005 European Real Estate Society conference in association with the International Real Estate Society. ERES: Conference. Dublin, Ireland, 2005.

Alfen, Hans Wilhelm, and Katrin Fischer. "Recent developments and constraints for Public-Private Partnershipin Germany." In 11th European Real Estate Society Conference. ERES: Conference. Milano, Italy, 2004.