High-Frequency and -Field Electron Paramagnetic Resonance Spectroscopic Analysis of Metal–Ligand Covalency in a 4f<sup>7</sup> Valence Series (Eu<sup>2+</sup>, Gd<sup>3+</sup>, and Tb<sup>4+</sup>)Thaige P. Gompa, Henry S. La Pierre, Ningxin Jiang et al.|Inorganic Chemistry|2021Cited by 39