• Absolute convergence with speed and matrix transformsAasma, Ants; Natarajan, Pinnangudi N.TWMS Journal of applied and engineering mathematics2024 / p. 1109-1120 https://jaem.isikun.edu.tr/web/index.php/archive/125-vol14no3/1241-absolute-convergence-with-speed-and-matrix-transforms
• An introductory course in summability theoryAasma, Ants; Dutta, Hemen; Natarajan, Pinnangudi N.2017
• Matrix transforms between sequence spaces defined by speeds of convergenceAasma, Ants; Natarajan, Pinnangudi N.Filomat2023 / p. 1029-1036 https://doi.org/10.2298/FIL2304029A https://www.scopus.com/sourceid/19900192450 https://www.scopus.com/record/display.uri?eid=2-s2.0-85147713973&origin=inward&txGid=0fdb8f8960de7c9be673250ce8ebb504 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=FILOMAT&year=2023 https://www.webofscience.com/wos/woscc/full-record/WOS:000963549000004
• Matrix transforms between subspaces of summability domains of matrices determined by speed of convergenceAasma, Ants; Natarajan, Pinnangudi N.Indian Journal of Mathematics2023 / p. 323-341 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85185908862&partnerID=40&md5=68a63c99a7ea221800fbd95b5e6b032b https://www.scopus.com/sourceid/21100235837 https://www.scopus.com/record/display.uri?eid=2-s2.0-85185908862&origin=inward&txGid=503cb24f2c35d55587dc125c629101ba
• 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
• Matrix transforms of speed-summable and speed-bounded sequencesAasma, Ants; Natarajan, Pinnangudi N.Facta Universitatis, Series : Mathematics and Informatics2023 / p. 805-816 https://doi.org/10.22190/FUMI230614052A
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• Matrix transforms of subspaces of summability domains of normal matrices determined by speedAasma, Ants; Natarajan, Pinnangudi N.Facta Universitatis, Series : Mathematics and Informatics2022 / p. 773-782 http://casopisi.junis.ni.ac.rs/index.php/FUMathInf/article/view/10761
• Matrix transforms of the set of α-absolutely convergent sequences with speedAasma, Ants; Natarajan, Pinnangudi N.Serdica mathematical journal2024 / p. 137-150 https://doi.org/10.55630/serdica.2024.50.137-150
• Matrix transforms of α -absolutely Aλ -summable sequencesAasma, Ants; Natarajan, Pinnangudi N.WSEAS transactions on mathematics2024 / p. 836-847 https://doi.org/10.37394/23206.2024.23.92
• 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
• Some classes of matrix transforms connected with subspaces of Maddox spaces defined by speeds of convergenceNatarajan, Pinnangudi N.; Aasma, AntsFilomat2024 / p. 8039-8046 https://doi.org/10.2298/FIL2423039N https://www.pmf.ni.ac.rs/filomat-content/2024/38-23/38-23-3-24287.pdf https://www.scopus.com/sourceid/19900192450 https://www.scopus.com/pages/publications/85213060423?inward https://jcr.clarivate.com/jcr-jp/journal-profile?journal=FILOMAT&year=2024 https://www.webofscience.com/wos/woscc/full-record/WOS:001380391800001
• Some classes of matrix transforms related to speed-Maddox spaces over ultrametric fieldsNatarajan, Pinnangudi N.; Aasma, AntsActa et commentationes Universitatis Tartuensis de mathematica2025 / p. 79-86 https://doi.org/10.12697/ACUTM.2025.29.05
• Some more results on matrix transform between speed-Maddox spaces over ultrametric fieldsNatarajan, Pinnangudi N.; Aasma, AntsWSEAS transactions on mathematics2025 / p. 542-550 https://doi.org/10.37394/23206.2025.24.54