@article{1177697514,
author = {Graybill, Franklin A. and Milliken, George},
title = {Quadratic Forms and Idempotent Matrices with Random Elements},
journal = {Ann. Math. Statist.},
volume = {40},
number = {6},
year = {1969},
pages = { 1430-1438},
language = {en},
url = {http://dml.mathdoc.fr/item/1177697514}
}
Graybill, Franklin A.; Milliken, George. Quadratic Forms and Idempotent Matrices with Random Elements. Ann. Math. Statist., Tome 40 (1969) no. 6, pp. 1430-1438. http://gdmltest.u-ga.fr/item/1177697514/