Bodnarchuk, Y.V. and Prokof’ev, P.H. (2009) “Locally nilpotent derivations and Nagata-type utomorphisms of a polynomial algebra”, Ukrains’kyi Matematychnyi Zhurnal, 61(8), pp. 1011–1024. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3077 (Accessed: 5 December 2025).