I. Matulková, I. Císařová, M. Fridrichová, R. Gyepes, P. Němec, J. Kroupa, and I. Němec. Inorganic Salts of N-phenylbiguanidium(1$\mathplus$){\textemdash}Novel Family with Promising Representatives for Nonlinear Optics. International Journal of Molecular Sciences, MDPI AG, volume 22, issue 16, August 2021. I. Matulková, M. Fridrichová, I. Císařová, P. Vaněk, F. Uhlík, and I. Němec. Vibrational spectroscopic and crystallographic study of the novel guanylurea salts with sulphuric and selenic acids. Journal of Molecular Structure, volume 1131, March 2017.