WASET
Somkhuean, R. , Niwitpong, S. , Niwitpong, S.. "Upper Bound of the Generalize p-Value for the Behrens-Fisher Problem with a Known Ratio of Variances". World Academy of Science, Engineering and Technology, Open Science Index 81, International Journal of Mathematical and Computational Sciences (2013), 7(9), 1436 - 1439.