• Matrix transforms from the set of sequences bounded with speed into the speed-maddox spaces over ultrametric fieldsNatarajan, Pinnangudi N.; Aasma, AntsFilomat2025
• Matrix transforms into the subsets of Maddox spaces defined by speedNatarajan, Pinnangudi N.; Aasma, AntsWSEAS transactions on mathematics2025 / p. 82-89 https://doi.org/10.37394/23206.2025.24.11
• Some Classes of Matrix Transformations between the Subsets of Maddox Spaces Defined by SpeedAasma, Ants; Natarajan, Pinnangudi N.WSEAS transactions on systems2024 / p. 508-516 https://doi.org/10.37394/23202.2024.23.52 https://wseas.com/journals/systems/2024/b065102-034(2024).pdf