TRANSFORMATIONS OF 2,6-DIMETHYL- AND 2,3-DIMETHYL-6-ETHYL-4-(2′-FURYL)PYRIDINES INVOLVING THE FURAN AND PYRIDINE RINGS СтатьяProstakov N.S., Soldatenkov A.T., Radzhan P.K., Khil'bert T.E.Chemistry of Heterocyclic Compounds. Том 18. 1982. С. 1287-1289