@article{CM_1976__33_1_15_0, author = {Singh, Balwant}, title = {A numerical criterion for the permissibility of a blowing-up}, journal = {Compositio Mathematica}, pages = {15--28}, publisher = {Noordhoff International Publishing}, volume = {33}, number = {1}, year = {1976}, zbl = {0335.14003}, mrnumber = {419435}, language = {en}, url = {http://www.numdam.org/item/CM_1976__33_1_15_0/} }