@article{03718398,
title = {On the block structure of PBIB designs.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {3},
year = {1980},
pages = {169-175},
doi = {10.1155/S0161171280000105},
zbl = {0458.62065},
language = {en},
url = {http://dml.mathdoc.fr/item/03718398}
}
Chandak, M.L. On the block structure of PBIB designs.. International Journal of Mathematics and Mathematical Sciences, Tome 3 (1980) pp. 169-175. doi : 10.1155/S0161171280000105. http://gdmltest.u-ga.fr/item/03718398/