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Hassett, Brendan; Kresch, Andrew; Tschinkel, Yuri (2016). On the moduli of degree 4 Del Pezzo surfaces. In: Fujino, O; Kondô, S; Moriwaki, A; Saito, M H. Development of Moduli Theory (Kyoto 2013). Kinokuniya: Kinokuniya Shoten, 349-386.