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 and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2008, vol. 18(6). 2120 - 2127
    [viewed 12 May 2021]. Available from: https://publications.waset.org/pdf/8360.