Isols and balanced block designs with λ=1
Compositio Mathematica, Tome 49 (1983) no. 1, pp. 75-93. 
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     title = {Isols and balanced block designs with $\lambda = 1$},
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     publisher = {Martinus Nijhoff Publishers},
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     year = {1983},
     zbl = {0524.05012},
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     url = {http://archive.numdam.org/item/CM_1983__49_1_75_0/}
}
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Dekker, J. C. E. Isols and balanced block designs with $\lambda = 1$. Compositio Mathematica, Tome 49 (1983) no. 1, pp. 75-93. http://archive.numdam.org/item/CM_1983__49_1_75_0/

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