no. 1
A numerical criterion for the permissibility of a blowing-up
Compositio Mathematica, Tome 33 (1976) no. 1, pp. 15-28. 
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     mrnumber = {419435},
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     url = {http://archive.numdam.org/item/CM_1976__33_1_15_0/}
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Singh, Balwant. A numerical criterion for the permissibility of a blowing-up. Compositio Mathematica, Tome 33 (1976) no. 1, pp. 15-28. http://archive.numdam.org/item/CM_1976__33_1_15_0/

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