1. é. Lukevits, I. Sleiksha, é. Liepin'sh, V. D. Shat-ts, I. Zitsmane, and A. Purvinya, Khim. Geterotsikl. Soedin., No. 12, 1644 (1991).
2. M. G. Voronkov, G. I. Zelchan, and é. Ya. Lukevits, Silicon and Life [in Russian], Zinatne, Riga (1971), p. 370.
3. é. Lukevits, é. é. Liepin'sh, and R. Ya. Sturkovich, Zh. Obshch. Khim., 47, 1790 (1977).
4. é. Lukevits, é. Liepin'sh, é. P. Popova, V. D. Shat-ts, and V. A. Belikov, Zh. Obshch. Khim., 50, 388 (1980).
5. é. é. Liepin'sh, I. A. Zitsmane, I. A. Sleiksha, and é. Lukevits, Izv. Akad. Nauk Latv. SSR, Ser. Khim., No. 6, 726 (1988).