[Crestani 1997] Crestani, F.: "Application of Spreading Activation Techniques in Information Retrieval"; Artificial Intelligence Review 11 (6)  (1997), 453--482.

[Salton and Buckley 1988] Salton, G. and Buckley, C.: "On the use of spreading activation methods in automatic information"; SIGIR '88: Proceedings of the 11th annual international ACM SIGIR conference on Research and development in information retrieval, ACM Press, New York, NY, USA (1988), 147--160.

[Collins and Loftus 1975] Collins, A. and Loftus: "A spreading activation theory of semantic memory"; Psychological Review 82 (1975), 407--428.