Hart, P. E., Nilsson, N. J., Perrault, R., Mitchell, T., Kulikowski, C. A., & Leake, D. B. (2003). In Memoriam: Charles Rosen, Norman Nielsen, and Saul Amarel. AI Magazine, 24(1), 6. https://doi.org/10.1609/aimag.v24i1.1683