USE OF PROTON MAGNETIC-RESONANCE METHOD IN STUDYING Z-E-ISOMERIZATION IN AZOMETHINES OF THE 7-METHYL-4-AZAFLUORENE SERIES Article FOMICHEV A.A., REZAKOV V.A., PLESHAKOV V.G., SVOREN V.A., GALIULLIN M.A., PROSTAKOV N.S. ZHURNAL ORGANICHESKOI KHIMII. MEZHDUNARODNAYA KNIGA / Санкт-Петербургская издательская фирма "Наука" Академиздатцентра РАН. Vol. 18. 1982. P. 2591-2594