Kitaoka, Y., Kyogaku, M., Asayama, K., Nakamura, H., Geibel, C., Schank, C., et al. (1993). NMR study of weak magnetism and superconductivity in heavy-fermion systems. Physica B-Condensed Matter, 186-88, 229-235. doi:10.1016/0921-4526(93)90538-H.