The ETSAP tools, MARKAL and TIMES, have been presented at the OR2001 conference. The corresponding papers have been selected for the conference proceedings. See OR 2001 site for pdf's of the two papers:

1. Seebregts, A.; Goldstein, G.; Smekens, K.: Energy/Environmental Modeling with the MARKAL Family of Models (at ECN site and at OR2001 site)
2. Remme, U.; Goldstein, G.; Schellmann, U.; Schlenzig, C. MESAP/Times - Advanced Decision Support for Energy and Environmental Planning (at OR2001 site)