WASET
    Mak Kaboudan,  A Two-Stage Multi-Agent System to Predict the Unsmoothed Monthly Sunspot Numbers.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    September 2009, vol. 33(9). 707 - 714
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/7970.