1. Admiraal, J.B.M. 2004. Developing a knowledge infrastructure for underground space in Indonesia. Proceeding 7th Joint Meeting JTA-COB, Stichting COB, Gouda, The Netherlands.
2. Parriaux, A, Tacher, L. & Joliquin, P. 2004. The hidden side of cities - towards three-dimensional land planning. Energy & Buildings, Volume36, Pages335-341.
3. Parriaux, A, Blunier, P, Maire, P. & Tacher, L. 2008. The urban underground in the deep city project: for construction but not only. Proceedings Underground space challenges in urban development, Stichting COB, Gouda, The Netherlands.