@article{10_4064_am34_1_4,
     author = {Czes{\l}aw St/epniak},
     title = {Characterizing experimental designs
 by properties of the
 standard quadratic forms of observations},
     journal = {Applicationes Mathematicae},
     pages = {39--45},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {2007},
     doi = {10.4064/am34-1-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am34-1-4/}
}