Lenarcik, Andrzej, and Mateusz Masternak. “Effective Proof of Guseĭn-Zade Theorem That Branches May Be Deformed With Jump One”. Analitic and Algebraic Geometry 4, edited by Tadeusz Krasiński and Stanisław Spodzieja, Lodz University Press, 2022, pp. 95-119, https://doi.org/10.18778/8331-092-3.09.