Geodesic
Extreme property of Student's distribution
Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 18, Tome 153 (1986), pp. 16-26 
N. K. Bakirov. Extreme property of Student's distribution. Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 18, Tome 153 (1986), pp. 16-26. http://geodesic.mathdoc.fr/item/ZNSL_1986_153_a1/
@article{ZNSL_1986_153_a1,
     author = {N. K. Bakirov},
     title = {Extreme property of {Student's} distribution},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {16--26},
     year = {1986},
     volume = {153},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1986_153_a1/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

In the paper extremums of d. f. of Student's ratio for not identically distributed observations are found.