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Luan, Tran Nhat; Hoang, Do Huy; Thuyet, Tran Minh
Information sciences, October 2021, 2021-10-00, Letnik: 574Journal Article
In this paper, we characterize the class of solutions for two open problems: one is Problem 1 which is posed by Ouyang et al. (2009), other is Problem 2 which is proposed by Borzová-Molnárová et al. (2015). Many results being wider than the previous ones have been stated. All are summarized in Theorems: 2,3,4,5,7,9,11 and 12.
