KYBERNETIKA, cilt.53, sa.5, ss.877-891, 2017 (SCI-Expanded)
In this paper, an equivalence on the class of nullnorms on a bounded lattice based on the equality of the orders induced by nullnorms is introduced. The set of all incomparable elements w.r.t. the order induced by nullnorms is investigated. Finally, the recently posed open problems have been solved.