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Shigeaki Sakurai and  Ken Ueno and  Ryohei Orihara,  Discovery of Time Series Event Patterns based on Time Constraints from Textual Data.   journal   = {International Journal of Computer, Electrical, Automation, Control and Information Engineering}, [online]. World Academy of Science, Engineering and Technology. June 2008, vol. 18(6). 2120 - 2127[viewed 23 July 2018]. Available from: http://waset.org/publications/8360.