This paper shows that Hotelling's $T^2$-test for testing $\mu = 0$ in the one-sample problem is robust against departures from normality in the following sense. It is still UMPI in a broad class of distributions, and the null distribution under any member of the class is the same as that under normality.
@article{1176345350,
author = {Kariya, Takeaki},
title = {A Robustness Property of Hotelling's $T^2$-Test},
journal = {Ann. Statist.},
volume = {9},
number = {1},
year = {1981},
pages = { 211-214},
language = {en},
url = {http://dml.mathdoc.fr/item/1176345350}
}
Kariya, Takeaki. A Robustness Property of Hotelling's $T^2$-Test. Ann. Statist., Tome 9 (1981) no. 1, pp. 211-214. http://gdmltest.u-ga.fr/item/1176345350/