REACTION OF INDOLIZINES WITH ELEMENTAL SULFUR ArticleProstakov N.S., Soldatenkov A.T., Bagdadi M.V., Brindkha O.S., Kuznetsov V.I., Rezakov V.A., Fomichev A.A.Chemistry of Heterocyclic Compounds. Vol. 20. 1984. P.. 1128-1132
