Grushevskaya, E., E. Dmitrieva, I. Lebedev, Y. Ryabikin, A. Temiraliev, and A. Fedosimova. “Method of Increase of signal/Noise Ratio in EPR Spectroscopy”. Recent Contributions to Physics, vol. 65, no. 2, June 2018, pp. 76-82, https://bph.kaznu.kz/index.php/zhuzhu/article/view/650.