Oleksik, Grzegorz, and Adam Rózycki. “Some Notes on the Lê Numbers in the Family of Line Singularities”. In Analitic and Algebraic Geometry 4, edited by Tadeusz Krasiński and Stanisław Spodzieja, 137–146. Poland: Lodz University Press, 2022. Accessed February 9, 2026. https://press.uni.lodz.pl/index.php/wul/catalog/book/1259/chapter/3685.