We work out normal forms for quasi-elliptic Enriques surfaces and give several applications. These include torsors and numerically trivial automorphisms, but our main application is the completion of the classification of Enriques surfaces with finite automorphism groups started by Kondo, Nikulin, Martin and Katsura-Kondo-Martin.

Comment: 32 pages; (epi)journal version

• 14J27 - Elliptic surfaces, elliptic or Calabi-Yau fibrations
• 14J28 - \(K3\) surfaces and Enriques surfaces

• 1 zbMATH Open