Holden J, Benczer-Koller N, Jakob G, Kumbartzki G, Mertzimekis TJ, Speidel K-H, Macchiavelli A, McMahan M, Phair L, Maier-Komor P, et al. Evidence for 2f$_{1/2}$ neutron strength in the low-energy structure of $^{144,146,148,150}Nd isotopes. Phys. Lett. B. 2000;493:7?11.