@article{10_4064_am_18_1_49_54,
     author = {G. S. Rogers},
     title = {Rank conditions for estimability of covariances},
     journal = {Applicationes Mathematicae},
     pages = {49--54},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {1983},
     doi = {10.4064/am-18-1-49-54},
     zbl = {0525.62055},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-18-1-49-54/}
}