1,2,3,9A-TETRAHYDRO-1-AZAFLUORENES Article Prostakov N.S., Soldatenkov A.T., Fedorov V.O., Semikopnyi A.I., Sytinskii I.A., Borisov M.I., Mufazalova T.P. Pharmaceutical Chemistry Journal. Vol. 15. 1981. P. 583-586