Sa-aat Niwitpong and  Rada Somkhuean and  Suparat Niwitpong,  Behrens-Fisher Problem with One Variance Unknown.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    September 2013, vol. 81(9). 1440 - 1443
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/16728.