Non-profit-making housing organizations : proceedings of the seminar organized by the Committee on Housing, Building and Planning of the United Nations Economic Commission for Europe and held in Varna-Zlatni Piassatzi (Bulgaria), from 11 to 21 October 1971The power of pro bono : 40 stories about design for the public good by architects and their clientsCulturele diversiteit in de podiumkunsten : een praktisch onderzoek naar initiatieven in Nederland en de Verenigde StatenZKP2 : @ 5Cyberconf, Madrid, June 1996