@article{01537382, title = {Frequency squares and affine designs.}, journal = {The Electronic Journal of Combinatorics [electronic only]}, volume = {7}, year = {2000}, zbl = {0961.05009}, language = {en}, url = {http://dml.mathdoc.fr/item/01537382} }
Mavron, V.C. Frequency squares and affine designs.. The Electronic Journal of Combinatorics [electronic only], Tome 7 (2000) . http://gdmltest.u-ga.fr/item/01537382/