L. D. Bogomolova, V. A. Zhachkin, V. N. Lazukin, N. F. Shapovalova, V. A. Shmukler, “Application of the electron spin resonance of $\mathrm{Cu}(\mathrm{II})$ to the investigation of glass structure in the system
$\mathrm{P}_2\mathrm{O}_5$ – $\mathrm{B}_2\mathrm{O}_3$ – $\mathrm{Cs}_2\mathrm{O}$”, Dokl. Akad. Nauk SSSR, 201:3 (1971), 563–566
