Voir la notice de l'article provenant de la source Numdam
@article{CM_1983__49_1_75_0, author = {Dekker, J. C. E.}, title = {Isols and balanced block designs with $\lambda = 1$}, journal = {Compositio Mathematica}, pages = {75--93}, publisher = {Martinus Nijhoff Publishers}, volume = {49}, number = {1}, year = {1983}, zbl = {0524.05012}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CM_1983__49_1_75_0/} }
Dekker, J. C. E. Isols and balanced block designs with $\lambda = 1$. Compositio Mathematica, Tome 49 (1983) no. 1, pp. 75-93. http://geodesic.mathdoc.fr/item/CM_1983__49_1_75_0/