... 12; VI Shvedov, GN Kurilo, AA Cherkasova, AN Grinev; Khim. Geterotsikl. Soedin. (1973), p. 1040 [Chem. Heterocycl. Compd. (Engl. Transl.), 1973, 9, 965]. 13; VG Nenajdenko, EP Zakurdaev, EV Prusov, ES Balenkova; Tetrahedron, 60 (2004), p. 11719. ...