1. M. Kars, T. Roisnel, V. Dorcet, A. Rebbah, and O.-D. L. Carlos, Acta Cryst. E 68, i11 (2012).
2. H. Mark and J. Steinbach, Z. Kristallogr. 64, 78 (1926).
3. Proceedings of the 2nd Int. Symp. on Univalent Mercury Halides, Trutnov, ChSFR (1989).
4. Č. Barta, A. A. Kaplyanskii, V. V. Kulakov, B. Z. Malkin, and Yu. F. Markov, Sov. Phys. JETP 70, 744 (1976).
5. B. S. Zadokhin, A. A. Kaplyanskii, Yu. F. Markov, and Č. Barta, Sov. Phys. Solid State 20(10), 1800 (1978).