1. Ch. Friedel and J. M. Crafts, Compt. rend.109, 692 (1885).
2. R. Anschuetz and H. Immendorf, Ber.17, 2816 (1884).
3. Yu. G. Mamedaliev, Synthesis of Toluene by the Alkylation and Dealkylation of Aromatic Hydrocarbons [in Russian] (Baku, Aznefteizdat, 1943), p. 72.
4. J. N. Jahanson and K. M. Watson, National Petr, News,38, N 32 (1946).
5. Yu. G. Mamedaliev, Izv. AN SSSR, Otd. Khim. N. 197 (1947).