@article{1177704279,
author = {Seiden, Esther},
title = {On Necessary Conditions for the Existence of Some Symmetrical and Unsymmetrical Triangular PBIB Designs and BIB Designs},
journal = {Ann. Math. Statist.},
volume = {34},
number = {4},
year = {1963},
pages = { 348-351},
language = {en},
url = {http://dml.mathdoc.fr/item/1177704279}
}
Seiden, Esther. On Necessary Conditions for the Existence of Some Symmetrical and Unsymmetrical Triangular PBIB Designs and BIB Designs. Ann. Math. Statist., Tome 34 (1963) no. 4, pp. 348-351. http://gdmltest.u-ga.fr/item/1177704279/