@article{01669814,
title = {Testing block sphericity of a covariance matrix.},
journal = {Divulgaciones Matem\'aticas},
volume = {9},
year = {2001},
pages = {25-34},
zbl = {0988.62032},
language = {en},
url = {http://dml.mathdoc.fr/item/01669814}
}
Cardeño, Liliam; Nagar, Daya K. Testing block sphericity of a covariance matrix.. Divulgaciones Matemáticas, Tome 9 (2001) pp. 25-34. http://gdmltest.u-ga.fr/item/01669814/