E. I. Troyanskii, R. F. Ismagilov, E. N. Korneeva, M. S. Pogosyan, G. I. Nikishin, “An Approach to 8-, 16- and 24-Membered Sulfur-containing Heterocycles via Homolytic Cycloaddition of Alkynes with Butane-1,4-dithiol”, Mendeleev Commun., 5:1 (1995), 18–20
