@article{10_4064_am_21_3_335_341,
     author = {H. Brzeskwiniewicz},
     title = {On the basic contrasts in {PBIB} designs},
     journal = {Applicationes Mathematicae},
     pages = {335--341},
     publisher = {mathdoc},
     volume = {21},
     number = {3},
     year = {1991},
     doi = {10.4064/am-21-3-335-341},
     zbl = {0773.62054},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-21-3-335-341/}
}