Kolyada, Sergiy Max Planck Institute for Mathematics, Max Planck Society;
Snoha, L'ubomír Max Planck Institute for Mathematics, Max Planck Society;
Kolyada, S., Snoha, L., & Trofimchuk, S. (2001). Noninvertible minimal maps. Fundamenta Mathematicae, 168, 141-163.