Oczkowicz, Katarzyna, Instytut Matematyki, Uniwersytet Śląski w Katowicach
Olatinwo, Memudu O., Department of Mathematics, Obafemi Awolowo University, Nigeria
Olbryś, Andrzej, Instytut Matematyki, Uniwersytet Śląski w Katowicach
Omaba, McSylvester Ejighikeme, Department of Mathematics College of Science University of Hafr Al Batin, KSA
Otero-Espinar, M. V., Department of Statistics, Mathematical Analysis and Optimization, University of Santiago de Compostela
Ouahab, Abdelghani, Laboratory of Mathematics, Univ Sidi Bel Abbes, Algeria

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