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This author gratefully acknowledges the support of the CNR of Italy and the hospitality of the University of Genoa and the Politecnico of Torino during part of the preparation of this work
This author was supported in part by a grant from the NSERC of Canada. He offers thanks also to the members of the Mathematics Department of Brandeis University for their kind hospitality during the initial stages of this research
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Davis, E.D., Geramita, A.V. Birational morphisms to ℙ2: An ideal-theoretic perspective. Math. Ann. 279, 435–448 (1988). https://doi.org/10.1007/BF01456280
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DOI: https://doi.org/10.1007/BF01456280