O. E. Nasakin, V. P. Sheverdov, O. V. Ershov, I. V. Moiseeva, A. N. Lyshchikov, V. N. Khrustalev, M. Yu. Antipin, “Single-stage synthesis of 3-amino-1,2-dicyano-4,6-diazabicyclo[3,2,1]oct-2-en-7-ones from β,β,γ,γ-tetracyanoalkanones”, Mendeleev Commun., 7:3 (1997), 112–113
