Novel synthesis of benzocrown ethers formylated in the benzene ring / S.P. Gromov, O.A. Fedorova, A.L. Vedernikov, V.V. Samoshin, M.V. Alfimov // Bulletin of the Russian Academy of Sciences. Division of Chemical Sciences. – 1993. – Т. 42. – № 5. – P. 960-961