K. Strnat; G. Hoffer; J. Olson; W. Ostertag; J. J. Becker (1967). "A Family of New Cobalt-Base Permanent Magnet Materials". Journal of Applied Physics. 38 (3): 1001–1002. Bibcode:1967JAP....38.1001S. doi:10.1063/1.1709459.
T. Ojima; S. Tomizawa; T. Yoneyama; T. Hori (1977). "Magnetic properties of a new type of rare-earth cobalt magnets Sm2(Co, Cu, Fe, M)17". IEEE Transactions on Magnetics. 13 (5): 1317. Bibcode:1977ITM....13.1317O. doi:10.1109/TMAG.1977.1059703.
K. Strnat; G. Hoffer; J. Olson; W. Ostertag; J. J. Becker (1967). "A Family of New Cobalt-Base Permanent Magnet Materials". Journal of Applied Physics. 38 (3): 1001–1002. Bibcode:1967JAP....38.1001S. doi:10.1063/1.1709459.
T. Ojima; S. Tomizawa; T. Yoneyama; T. Hori (1977). "Magnetic properties of a new type of rare-earth cobalt magnets Sm2(Co, Cu, Fe, M)17". IEEE Transactions on Magnetics. 13 (5): 1317. Bibcode:1977ITM....13.1317O. doi:10.1109/TMAG.1977.1059703.