Resolution graphs with 3 or 4 large nodes do not admit QHD smoothings; new combinatorial examples and a new proof of the Bhupal-Stipsicz theorem are given via reduction and enumeration.
Sandwiched singularities and desingularization of surfaces by normalized Nash transformations.Annals of mathematics, pages 411–491, 1990
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Minimal rational graphs admitting a QHD smoothing
Resolution graphs with 3 or 4 large nodes do not admit QHD smoothings; new combinatorial examples and a new proof of the Bhupal-Stipsicz theorem are given via reduction and enumeration.