Isols and balanced block designs with λ=1
Compositio Mathematica, Volume 49 (1983) no. 1, p. 75-93
@article{CM_1983__49_1_75_0,
     author = {Dekker, J. C. E.},
     title = {Isols and balanced block designs with $\lambda = 1$},
     journal = {Compositio Mathematica},
     publisher = {Martinus Nijhoff Publishers},
     volume = {49},
     number = {1},
     year = {1983},
     pages = {75-93},
     zbl = {0524.05012},
     language = {en},
     url = {http://www.numdam.org/item/CM_1983__49_1_75_0}
}
Dekker, J. C. E. Isols and balanced block designs with $\lambda = 1$. Compositio Mathematica, Volume 49 (1983) no. 1, pp. 75-93. http://www.numdam.org/item/CM_1983__49_1_75_0/

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