Teplins’kyi OY. Examples of $C^1$-smoothly conjugate diffeomorphisms of the circle with break that are not $C^{1+γ}$ -smoothly conjugate. Ukr. Mat. Zhurn. [Internet]. 2010Aug.25 [cited 2024Apr.23];62(8):1092–1105. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/2939