String Processing and Information Retrieval 19th International Symposium, SPIRE 2012, Cartagena de Indias, Colombia, October 21-25, 2012. Proceedings - Calderón-Benavides, Liliana; González-Caro, Cristina; Chávez, Edgar; Ziviani, Nivio (Springer Berlin Heidelberg : Imprint: Springer, 2012)