REDUCTION OF QUATERNARY SALTS OF 3-AZAFLUORENE AND 3-AZAFLUORENONE AND THEIR CONVERSION TO INDENOINDOLIZINES Article Prostakov N.S., Soldatenkov A.T., Radzhan P.K., Samal'oa A., Zakharov V.F., Zvolinskii V.P. Chemistry of Heterocyclic Compounds. Латвийский институт органического синтеза Латвийской академии наук / Springer New York Consultants Bureau. Vol. 19. 1983. P. 206-209