EngineModel describes the core elements of Egothor's architecture. Before you read more about algorithms, you might be interested in how the properties and names of the core objects were arrived at. For this, see ObjectsNaming.
References
Leo Galambos: Semi-automatic Stemmer Evaluation. International Intelligent Information Processing and Web Mining Conference, 2004, Zakopane, Poland.
Leo Galambos: Dynamization in IR Systems. International Intelligent Information Processing and Web Mining Conference, 2004, Zakopane, Poland.
Ricardo Baeza-Yates, Berthier Ribeiro-Neto: Modern Information Retrieval, Addison Wesley 1999, ISBN 0-201-39829-X.
Alistair Moffat, Justin Zobel: Self-Indexing Inverted Files for Fast Text Retrieval, ACM TIS, 1996/10, Vol 14/4.