1. Chira, C., Pintea, C.-M., Dumitrescu, D.: “Stigmergic Agents for Solving NP-difficult Problems”, Proceedings of Bio-Inspired Computing: Theory and Applications Conference, Evolutionary Computing volume, Wuhan, China (2006) 63–69
2. Camazine, S., Deneubourg, J.L., Franks, N.R., Sneyd, J., Theraulaz, G., Bonabeau, E.: “Self organization in biological systems”; Princeton Univ. Press (2001)
3. Grasse, P.-P.: “La Reconstruction du Nid et Les Coordinations Interindividuelles Chez Bellicositermes Natalensis et Cubitermes sp. La Thorie de la Stigmergie: Essai dinterprtation du Comportement des Termites Constructeurs”, Insect Soc., 6 (1959) 41–80
4. Dorigo, M., Di Caro, G., Gambardella, L.M.: “Ant algorithms for discrete optimization”, Artificial Life, 5 (1999) 137–172
5. Dorigo M., Blum, C.: “Ant Colony Optimization Theory: A Survey”, Theoretical Computer Science, 3442–3 (2005) 243–278