| #261 | Matematický časopis. -- Bratislava : Vydavatelstvo SAV, 1951-1975. -- ISSN 0025-5173 |
| #262 | Materiálové inžinierstvo. -- Žilina : Strojnícka fakulta Žilinskej univerzity, 1994-. -- ISSN 1335-0803 |
| #263 | Materials science and technology. -- London : Institute of Materials, 1985-. -- ISSN 0267-0836 print. -- ISSN 1743-2847 online |
| #264 | Mathematica Bohemica. -- Praha : Matematický ústav AV ČR, 1991-. -- ISSN 0862-7959 |
| #265 | Mathematica slovaca. -- Bratislava : Mathematical Institute of the Slovak Academy of Sciences, 1976-. -- ISSN 0139-9918 print. -- ISSN 1337-2211 online |
| #266 | Mathematical reviews. -- Lancaster : American Mathematical Society, 1940-. -- ISSN 0025-5629 |
| #267 | Mathematics of computation. -- Providence : American Mathematical Society, 1960-. -- ISSN 0025-5718 print. -- ISSN 1088-6842 online |
| #268 | Mathematische Annalen. -- Berlin : Springer, 1869-. -- ISSN 0025-5831 print. -- ISSN 1432-1807 online |
| #269 | Mathematische Nachrichten. -- Berlin : Akademie-Verlag, 1948-. -- ISSN 0025-584X |
| #270 | Mechanical engineering. -- New York : American Society of Mechanical Engineers, 1919-. -- ISSN 0025-6501 |