Matrix Transforms Into the Speed-Maddox Spaces Over Ultrametric Fields IINatarajan, Pinnangudi Narayanasubramanian; Aasma, AntsPublications de l Institut Mathematique2025 / p. 89-96 https://doi.org/10.2298/PIM2532089N http://elib.mi.sanu.ac.rs/files/journals/publ/138/publn138p89-96.pdf