Помогите ознакомиться со статьей:
L. Klasinc, E. Pop, N. Trinajstić, J.V. Knop,"Theoretical studies of positional isomers obtained by annelation of benzene and 5-membered ring heterocyclics containing nitrogen, oxygen, or sulphur", Tetrahedron, Vol. 28, Iss. 13, 1972, стр. 3465-3474.
- DOI:
http://dx.doi.org/10.1016/0040-4020(72)88107-9
