1. Basu, C., Hirsh, H., & Cohen, W.W. (1998). Recommendation as classification: using social and content-based information in recommendation, in Proceedings of the Fifteenth National Conference on Artificial Intelligence (AAAI-98). Madison, Wisconsin, AAAI Press, pp. 714–720.
2. Bedi, P., Sharma, R., & Kaur, H. (2009). Recommender System based on collaborative behavior of ants, Journal of Artificial Intelligence 2009, Asian Network for Scientific Information, ISSN 1994–5450, pp. 40–55.
3. Billsus, D. &. Pazzani, M. J. (1998). Learning collaborative information filters, in Proceedings of the Fifteenth International Conference on Machine Learning, Madison, Morgan Kaufman San Francisco, CA, pp. 46–54.
4. Blum, C. (2005). Ant Colony Optimization: Introduction and recent trends. Physics of Life Reviews Journal, Elsevier, 2(4), pp. 353–373. doi:10.1016/j.plrev.2005.10.001.
5. Bonabeau, E., Dorigo, M. & Theraulaz, G. (1999). Swarm Intelligence: From natural to artificial systems. Santa Fe Institute Studies in the Sciences of Complexity, Oxford University Press (New York). ISBN: 0-19-513158-4, Kindle Edition.