REACTION OF 9-DIAZO-4-AZAFLUORENE WITH UNSATURATED COMPOUNDS AND CYCLIC KETONES ArticleProstakov N.S., Varlamov A.V., Hussein A., Fomichev A.A., Ryabova N.A., Stashenko E.E.Chemistry of Heterocyclic Compounds. Vol. 26. 1990. P.. 424-430