Derek J. Sollenberger Sollenberger, D. J., & Singh, M. P. (2012). Koko: an architecture for affect-aware games. AUTONOMOUS AGENTS AND MULTI-AGENT SYSTEMS, 24(2), 255–286. https://doi.org/10.1007/s10458-010-9160-3 Sollenberger, D. J., & Singh, M. P. (2011). Methodology for engineering affective social applications. Agent-oriented software engineering x, 6038, 97–109. Sollenberger, D. J., & Singh, M. P. (2009). Architecture for affective social games. Agents for games and simulations: trends in techniques, concepts and design, 5920, 79–94.