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2. Akbulut, S.: 4-Manifolds. Oxford Graduate Texts in Mathematics, vol. 25. Oxford University Press, Oxford (2016)
3. Akbulut, S.: The Dolgachev surface. Disproving Harer–Kas–Kirby conjecture. Comment. Math. Helv. 87(1), 187–241 (2012)
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5. Akbulut, S.: On the smale conjecture for Diff$$(S^{4})$$. https://arxiv.org/pdf/2008.07269.pdf