Existence of standard models for degree 4 del Pezzo fibrations over curves is proved in characteristic not 2, using semistable pencils of quadrics and terminal singularity analysis.
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On the standard models of del Pezzo fibrations of degree four
Existence of standard models for degree 4 del Pezzo fibrations over curves is proved in characteristic not 2, using semistable pencils of quadrics and terminal singularity analysis.