Classifies all QHD degenerations of elliptic surfaces, realizes them for Dolgachev surfaces D_{a,b}, and proves the minimal slc models are unobstructed and deform to known degenerations.
Kawamata,Crepant blowing-up of3-dimensional canonical singularities and its application to degenerations of surfaces, Ann
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Rational homology disk degenerations of elliptic surfaces
Classifies all QHD degenerations of elliptic surfaces, realizes them for Dolgachev surfaces D_{a,b}, and proves the minimal slc models are unobstructed and deform to known degenerations.